Extramural Research
Bibliometrics
Grantee Research Project Results
2005 Bibliometric Analysis (Revised) for Papers on Topics Related to Particulate Matter(PM) (1998-2005)
March 2005 Report (Revised September 2007)
This is a bibliometric analysis of the papers prepared by intramural and extramural researchers of the U.S. Environmental Protection Agency (EPA) on topics related to particulate matter (PM). For this analysis, 904 papers were reviewed. These 904 papers, published from 1998 to 2005, were cited 9,578 times in the journals covered by Thomsons Web of Science.1 Of these 904 papers, 723 (80%) have been cited at least once in a journal.
The analysis was completed using Thomsons Essential Science Indicators (ESI) and Journal Citation Reports (JCR) as benchmarks. ESI provides access to a unique and comprehensive compilation of essential science performance statistics and science trends data derived from Thomsons databases. The chief indicators of output, or productivity, are journal article publication counts. For influence and impact measures, ESI employs both total citation counts and cites per paper scores. The former reveals gross influence while the latter shows weighted influence, also called impact. JCR presents quantifiable statistical data that provide a systematic, objective way to evaluate the worlds leading journals and their impact and influence in the global research community.
Summary of Analysis
More than one-quarter of the PM publications are highly cited papers. A review of the citations indicates that 258 (28.5%) of the PM papers qualify as highly cited when using the ESI criteria for the top 10% of highly cited publications. Forty-nine (5.4%) of the PM papers qualify as highly cited when using the criteria for the top 1%. Twelve (1.3%) of these papers qualify as very highly cited (in the top 0.1%), and two papers (0.2% of the papers analyzed) actually meet the top 0.01% threshold.
The PM papers are more highly cited than the average paper. Using the ESI average citation rates for papers published by field as the benchmark, in 10 of the 14 fields in which the EPA PM papers were published, the ratio of actual to expected cites is greater than 1, indicating that the PM papers are more highly cited than the average papers in those fields. For all 14 fields combined, the ratio of actual cites to expected cites is 2.3, indicating that the PM papers are more highly cited than the average paper.
Nearly one-third of the PM papers are published in very high impact journals. Two-hundred fifty-four (254) of 904 papers were published in the top 10% of journals ranked by JCR Impact Factor, representing 28% of EPAs PM papers. Nearly one-third of the PM papers are published in the top 10% of journals ranked by JCR Immediacy Index. Two-hundred sixty-seven (267) of the 904 papers appear in the top 10% of journals, representing 29.5% of EPAs PM papers.
Seventeen of the PM papers qualify as hot papers. Using the hot paper thresholds established by ESI as a benchmark, 17 hot papers, representing 1.9% of the PM papers, were identified in the analysis.
The authors cite themselves less than the average author. Five hundred thirty-seven (537) of the 9,578 cites are author self-cites. This 5.6% author self-citation rate is below the accepted range of 10-30% author self-citation rate.
Highly Cited PM Publications
The 904 PM papers reviewed for this analysis covered 14 of the 22 ESI fields. The distribution of the papers among these 14 fields and the number of citations by field are presented in Table 1.
Table 1. PM Papers by ESI Fields
ESI Field |
No. of Citations |
No. of EPA PM Papers |
Average Cites/Paper |
Clinical Medicine |
2,441 |
157 |
15.55 |
Environment/Ecology |
2,102 |
171 |
12.29 |
Geosciences |
1,607 |
170 |
9.45 |
Engineering |
1,256 |
176 |
7.14 |
Pharmacology & Toxicology |
1,166 |
123 |
9.48 |
Chemistry |
372 |
50 |
7.44 |
Biology & Biochemistry |
197 |
20 |
9.85 |
Multidisciplinary |
157 |
4 |
39.25 |
Immunology |
155 |
8 |
19.37 |
Physics |
73 |
10 |
7.30 |
Neuroscience & Behavior |
30 |
4 |
7.50 |
Plant & Animal Sciences |
12 |
3 |
4.00 |
Mathematics |
7 |
4 |
1.75 |
Social Sciences |
3 |
4 |
0.75 |
Total = 9,578 |
Total = 904 |
10.6 |
There were 258 (28.5% of the papers analyzed) highly cited EPA PM papers in 10 of the 14 fields in which the papers are publishedEnvironment/Ecology, Engineering, Pharmacology & Toxicology, Clinical Medicine, Multidisciplinary, Biology & Biochemistry, Chemistry, Molecular Biology & Genetics, Immunology, and Mathematicswhen using the ESI criteria for the top 10% of papers. Table 2 shows the number of EPA papers in those 10 fields that met the top 10% threshold in ESI. Forty-nine (5.4%) of the papers analyzed qualified as highly cited when using the ESI criteria for the top 1% of papers. These papers covered five fieldsClinical Medicine, Engineering, Environment/Ecology, Geosciences, and Multidisciplinary. Table 3 shows the 49 papers by field that met the top 1% threshold in ESI. The citations for these 49 papers are provided in Tables 4 through 8. There were 12 very highly cited EPA PM papers in three fieldsEngineering, Environment/Ecology, and Clinical Medicine (see Table 9). These 12 papers met the top 0.1% threshold in ESI (1.3% of the papers analyzed). The citations for these 12 very highly cited papers are listed in Table 10. Two (0.2% of the papers analyzed) of the PM papers actually met the top 0.01% threshold in ESI (see Table 11). These papers are presented in Table 12.
Table 2. Number of Highly Cited PM Papers by Field (top 10%)
ESI Field |
No. of Citations |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
Environment/Ecology |
1,593 |
70 |
22.8 |
40.9% |
Clinical Medicine |
1,459 |
26 |
56.1 |
16.6% |
Geosciences |
1,176 |
59 |
19.9 |
34.7% |
Engineering |
1,028 |
70 |
14.7 |
39.8% |
Pharmacology & Toxicology |
570 |
16 |
35.6 |
13.0% |
Chemistry |
193 |
8 |
24.1 |
16.0% |
Multidisciplinary |
153 |
3 |
51.0 |
75.0% |
Immunology |
119 |
3 |
39.7 |
37.5% |
Biology & Biochemistry |
28 |
1 |
28.0 |
5.0% |
Mathematics |
5 |
2 |
2.5 |
50.0% |
Total = 6,324 |
Total = 258 |
24.51 |
28.5% |
Table 3. Number of Highly Cited PM Papers by Field (top 1%)
ESI Field |
No. of Citations |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
Clinical Medicine |
619 |
4 |
154.8 |
2.6% |
Engineering |
615 |
26 |
23.6 |
14.8% |
Environment/Ecology |
446 |
12 |
37.2 |
7.0% |
Geosciences |
328 |
5 |
65.6 |
2.9% |
Multidisciplinary |
88 |
1 |
88.0 |
25.0% |
Total = 2,096 |
Total = 49 |
42.8 |
5.4% |
Table 4. Highly Cited PM Papers in the Field of Clinical Medicine (top 1%)
No. of Cites |
First Author |
Paper |
275 |
Pope CA |
Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution. JAMA-Journal of the American Medical Association 2002;287(9):1132-1141. |
124 |
Abbey DE |
Long-term inhalable particles and other air pollutants related to mortality in nonsmokers. American Journal of Respiratory and Critical Care Medicine 1999;159(2):373-382. |
124 |
Gold DR |
Ambient pollution and heart rate variability. Circulation 2000;101(11):1267-1273. |
96 |
Peters A |
Increased particulate air pollution and the triggering of myocardial infarction. Circulation 2001;103(23):2810-2815. |
Table 5. Highly Cited PM Papers in the Field of Engineering (top 1%)
No. of Cites |
First Author |
Paper |
75 |
Jayne JT |
Development of an aerosol mass spectrometer for size and composition analysis of submicron particles. Aerosol Science and Technology 2000;33(1-2):49-70. |
56 |
Weber RJ |
A particle-into-liquid collector for rapid measurement of aerosol bulk chemical composition. Aerosol Science and Technology 2001;35(3):718-727. |
50 |
Woo KS |
Measurement of Atlanta aerosol size distributions: Observations of ultrafine particle events. Aerosol Science and Technology 2001;34(1):75-87. |
40 |
Long CM |
Characterization of indoor particle sources using continuous mass and size monitors. Journal of the Air & Waste Management Association 2000;50(7):1236-1250. |
40 |
Sarnat JA |
Assessing the relationship between personal particulate and gaseous exposures of senior citizens living in Baltimore, MD. Journal of the Air & Waste Management Association 2000;50(7):1184-1198. |
35 |
Zhu YF |
Concentration and size distribution of ultrafine particles near a major highway. Journal of the Air & Waste Management Association 2002;52(9):1032-1042. |
33 |
Zhang Y |
Simulation of aerosol dynamics: A comparative review of algorithms used in air quality models. Aerosol Science and Technology 1999;31(6):487-514. |
31 |
Lewtas J |
Comparison of sampling methods for semi-volatile organic carbon associated with PM2.5. Aerosol Science and Technology 2001;34 (1):9-22. |
28 |
McMurry PH |
The relationship between mass and mobility for atmospheric particles: A new technique for measuring particle density. Aerosol Science and Technology 2002;36(2):227-238. |
26 |
Christoforou CS |
Trends in fine particle concentration and chemical composition in Southern California. Journal of the Air & Waste Management Association 2000;50(1):43-53. |
25 |
Mallina RV |
High speed particle beam generation: A dynamic focusing mechanism for selecting ultrafine particles, Aerosol Science and Technology 2000;33(1-2):87-104. |
23 |
Tolocka MP |
East versus West in the US: Chemical characteristics of PM2.5 during the winter of 1999. Aerosol Science and Technology 2001;34(1):88-96. |
21 |
Mosley RB |
Penetration of ambient fine particles into the indoor environment. Aerosol Science and Technology 2001;34(1):127-136. |
19 |
Vette AF |
Characterization of indoor-outdoor aerosol concentration relationships during the Fresno PM exposure studies. Aerosol Science and Technology 2001;34(1):118-126. |
15 |
Phares DJ |
Performance of a single ultrafine particle mass spectrometer. Aerosol Science and Technology 2002;36(5):583-592. |
14 |
Zhang XF |
A numerical characterization of particle beam collimation by an aerodynamic lens-nozzle system: Part I. An individual lens or nozzle. Aerosol Science and Technology 2002;36(5):617-631. |
13 |
Frey HC |
Quantification of variability and uncertainty in lawn and garden equipment NOx and total hydrocarbon emission factors. Journal of the Air & Waste Management Association 2002;52(4):435-448. |
13 |
Kim S |
Size distribution and diurnal and seasonal trends of ultrafine particles in source and receptor sites of the Los Angeles basin. Journal of the Air & Waste Management Association 2002;52(3):297-307. |
12 |
Lewis CW |
Source apportionment of phoenix PM2.5 aerosol with the Unmix receptor model. Journal of the Air & Waste Management Association 2003;53(3):325-338. |
11 |
Drewnick F |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part I: Mass concentrations. Aerosol Science and Technology 2004;38 (Suppl 1):92-103. |
8 |
Drewnick F |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part II: Chemically speciated mass distributions. Aerosol Science and Technology 2004;38(Suppl 1):104-117. |
7 |
Cho AK |
Determination of four quinones in diesel exhaust particles, SRM 1649a, an atmospheric PM2.5. Aerosol Science and Technology 2004;38(Suppl 1):68-81. |
6 |
Stanier CO |
Nucleation events during the Pittsburgh air quality study: Description and relation to key meteorological, gas phase, and aerosol parameters. Aerosol Science and Technology 2004;38(Suppl 1):253-264. |
6 |
Hogrefe O |
Development, operation and applications of an aerosol generation, calibration and research facility. Aerosol Science and Technology 2004;38(Suppl 1):196-214. |
5 |
Canagaratna MR |
Chase studies of particulate emissions from in-use New York City vehicles. Aerosol Science and Technology 2004;38(6):555-573. |
3 |
Stanier CO |
A method for the in situ measurement of fine aerosol water content of ambient aerosols: The dry-ambient aerosol size spectrometer (DAASS). Aerosol Science and Technology 2004;38(Suppl 1):215-228. |
Table 6. Highly Cited PM Papers in the Field of Environment/Ecology (top 1%)
No. of Cites |
First Author |
Paper |
110 |
Liao DP |
Daily variation of particulate air pollution and poor cardiac autonomic control in the elderly. Environmental Health Perspectives 1999;107(7):521-525. |
96 |
Laden F |
Association of fine particulate matter from different sources with daily mortality in six US cities. Environmental Health Perspectives 2000;108(10):941-947. |
69 |
Oberdorster G |
Pulmonary effects of inhaled ultrafine particles. International Archives of Occupational and Environmental Health 2001;74 (1):1-8. |
43 |
Dockery DW |
Epidemiologic evidence of cardiovascular effects of particulate air pollution. Environmental Health Perspectives 2001;109(Suppl 4):483-486. |
41 |
Li N |
Ultrafine particulate pollutants induce oxidative stress and mitochondrial damage. Environmental Health Perspectives 2003;111(4):455-460. |
32 |
Lioy PJ |
Characterization of the dust/smoke aerosol that settled east of the World Trade Center (WTC) in Lower Manhattan after the collapse of the WTC 11 September 2001. Environmental Health Perspectives 2002;110(7):703-714. |
20 |
Park K |
Relationship between particle mass and mobility for diesel exhaust particles. Environmental Science & Technology 2003;37(3):577-583. |
12 |
Offenberg JH |
Persistent organic pollutants in the dusts that settled across lower Manhattan after September 11, 2001. Environmental Science & Technology 2003;37(3):502-508. |
11 |
McGee JK |
Chemical analysis of World Trade Center fine particulate matter for use in toxicologic assessment. Environmental Health Perspectives 2003;111(7):972-980. |
4 |
DeMarini DM |
Bioassay-directed fractionation and Salmonella mutagenicity of automobile and forklift diesel exhaust particles. Environmental Health Perspectives 2004;112(8):814-819. |
4 |
Landrigan PJ |
Health and environmental consequences of the World Trade Center disaster. Environmental Health Perspectives 2004;112(6):731-739. |
4 |
Singh P |
Sample characterization of automobile and forklift diesel exhaust particles and comparative pulmonary toxicity in mice. Environmental Health Perspectives 2004;112(8):820-825. |
Table 7. Highly Cited PM Papers in the Field of Geosciences (top 1%)
No. of Cites |
First Author |
Paper |
97 |
Yu JZ |
Gas-phase ozone oxidation of monoterpenes gaseous and particulate products. Journal of Atmospheric Chemistry 1999;34(2):107-258. |
92 |
Simoneit BRT |
Levoglucosan, a tracer for cellulose in biomass burning and atmospheric particles. Atmospheric Environment 1999;33(2):173-182. |
86 |
Griffin RJ |
Organic aerosol formation from the oxidation of biogenic carbons. Journal of Geophysical Research Atmospheres 1999;104(D3):3555-3567. |
32 |
Zhu YF |
Study of ultrafine particles near a major highway with heavy-duty diesel traffic. Atmospheric Environment 2002;36(27):4323-4335. |
21 |
Orsini DA |
Refinements to the particle-into-liquid sampler (PILS) for ground and airborne measurements of water soluble aerosol composition. Atmospheric Environment 2003;37(9-10):1243-1259. |
Table 8. Highly Cited PM Papers in the Field of Multidisciplinary (top 1%)
No. of Cites |
First Author |
Paper |
88 |
Gard EE |
Direct observation of heterogeneous chemistry in the atmosphere. Science 1998;279(5354):1184-1187. |
Table 9. Number of Highly Cited PM Papers by Field (top 0.1%)
ESI Field |
No. of Citations |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
Clinical Medicine |
275 |
1 |
275.0 |
% |
Engineering |
259 |
10 |
25.9 |
14.8% |
Environment/Ecology |
41 |
1 |
41.0 |
7.0% |
Total = 575 |
Total = 12 |
47.9 |
1.3% |
Table 10. Very Highly Cited PM Papers (Top 0.1%)
Field |
No. of Cites |
First Author |
Paper |
Clinical Medicine |
275 |
Pope CA |
Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution. JAMA-Journal of the American Medical Association 2002;287(9):1132-1141. |
Engineering |
75 |
Jayne JT |
Development of an aerosol mass spectrometer for size and composition analysis of submicron particles. Aerosol Science and Technology 2000;33(1-2):49-70. |
Engineering |
56 |
Weber RJ |
A particle-into-liquid collector for rapid measurement of aerosol bulk chemical composition. Aerosol Science and Technology 2001;35(3):718-727. |
50 |
Woo KS |
Measurement of Atlanta aerosol size distributions: observations of ultrafine particle events. Aerosol Science and Technology 2001;34(1):75-87. |
|
35 |
Zhu YF |
Concentration and size distribution of ultrafine particles near a major highway. Journal of the Air & Waste Management Association 2002;52(9):1032-1042. |
|
11 |
Drewnick |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part I: Mass concentrations. Aerosol Science and Technology 2004;38 (Suppl 1):92-103. |
|
8 |
Drewnick |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part II: Chemically speciated mass distributions. Aerosol Science and Technology 2004;38(Suppl 1):104-117. |
|
7 |
Cho AK |
Determination of four quinones in diesel exhaust particles, SRM 1649a, an atmospheric PM2.5. Aerosol Science and Technology 2004;38(Suppl 1):68-81. |
|
6 |
Hogrefe O |
Development, operation and applications of an aerosol generation, calibration and research facility. Aerosol Science and Technology 2004;38(Suppl 1):196-214. |
|
6 |
Stanier CO |
Nucleation events during the Pittsburgh air quality study: Description and relation to key meteorological, gas phase, and aerosol parameters. Aerosol Science and Technology 2004;38(Suppl 1):253-264. |
|
5 |
Canagaratna MR |
Chase studies of particulate emissions from in-use New York City vehicles. Aerosol Science and Technology 2004;38(6):555-573. |
|
Environment/ |
41 |
Li N |
Ultrafine particulate pollutants induce oxidative stress and mitochondrial damage. Environmental Health Perspectives 2003;111(4):455-460. |
Table 11. Number of Extremely Highly Cited PM Papers by Field (top 0.01%)
ESI Field |
No. of Citations |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
Engineering |
19 |
2 |
9.5 |
0.2% |
Total = 19 |
Total = 2 |
9.5 |
0.2% |
Table 12. Extremely Highly Cited PM Papers (Top 0.01%)
Field |
No. of Cites |
First Author |
Paper |
Engineering |
11 |
Drewnick |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part I: Mass concentrations. Aerosol Science and Technology 2004;38 (Suppl 1):92-103. |
8 |
Drewnick |
Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part II: Chemically speciated mass distributions. Aerosol Science and Technology 2004;38(Suppl 1):104-117. |
Ratio of Actual Cites to Expected Citation Rates
The expected citation rate is the average number of cites that a paper published in the same journal in the same year and of the same document type (article, review, editorial, etc.) has received from the year of publication to the present. Using the ESI average citation rates for papers published by field as the benchmark, in 10 of the 14 fields in which the EPA PM papers were published, the ratio of actual to expected cites is greater than 1, indicating that the EPA papers are more highly cited than the average papers in those fields. For all 14 fields combined, the ratio of actual to expected cites (9,578 to 4,116.80) is 2.3, indicating that the PM papers are more highly cited than the average paper (see Table 13).
Table 13. Ratio of Average Cites to Expected Cites for PM Papers by Field
ESI Field |
Total Cites |
Expected Cite Rate |
Ratio |
Biology & Biochemistry |
197 |
218.48 |
0.9 |
Chemistry |
372 |
277.52 |
1.3 |
Clinical Medicine |
2,441 |
1,003.49 |
2.4 |
Engineering |
1,256 |
275.21 |
4.6 |
Environment/Ecology |
2,102 |
713.18 |
2.9 |
Geosciences |
1,607 |
665.28 |
2.4 |
Immunology |
155 |
103.32 |
1.5 |
Mathematics |
7 |
2.50 |
2.8 |
Multidisciplinary |
157 |
21.22 |
7.4 |
Neuroscience & Behavior |
30 |
34.01 |
0.9 |
Pharmacology & Toxicology |
1,166 |
714.26 |
1.6 |
Physics |
73 |
45.02 |
1.6 |
Plant & Animal Science |
12 |
39.24 |
0.3 |
Social Sciences |
3 |
4.07 |
0.7 |
Totals |
9,578 |
4,116.80 |
2.3 |
JCR Benchmarks
The Impact Factor is a well known metric in citation analysis. It is a measure of the frequency with which the average article in a journal has been cited in a particular year. The Impact Factor helps evaluate a journals relative importance, especially when compared to others in the same field. The Impact Factor is calculated by dividing the number of citations in the current year to articles published in the 2 previous years by the total number of articles published in the 2 previous years.
Table 14 indicates the number of PM papers published in the top 10% of journals, based on the JCR Impact Factor. Two hundred fifty-four (254) of 904 papers were published in the top 10% of journals, representing 28% of EPAs PM papers.
Table 14. PM Papers in Top 10% of Journals by JCR Impact Factor
EPA PM Papers in that Journal |
Journal |
Impact Factor |
JCR IF Rank |
64 |
Environmental Health Perspectives |
3.408 |
538 |
62 |
Environmental Science & Technology |
3.592 |
487 |
26 |
American Journal of Physiology-Lung Cellular and Molecular Physiology |
3.735 |
435 |
20 |
Epidemiology |
4.220 |
350 |
17 |
American Journal of Respiratory and Critical Care Medicine |
8.876 |
100 |
17 |
American Journal of Respiratory Cell and Molecular Biology |
4.015 |
380 |
7 |
Analytical Chemistry |
5.250 |
248 |
5 |
Circulation |
11.164 |
72 |
4 |
Journal of Biological Chemistry |
6.482 |
179 |
4 |
Journal of Immunology |
6.702 |
167 |
3 |
Science |
29.781 |
11 |
3 |
Free Radical Biology and Medicine |
5.063 |
260 |
3 |
American Journal of Epidemiology |
4.486 |
310 |
3 |
Thorax |
4.188 |
356 |
2 |
Lancet |
18.316 |
28 |
2 |
Chest |
3.264 |
585 |
2 |
Chemical Research in Toxicology |
3.332 |
555 |
1 |
New England Journal of Medicine |
34.833 |
5 |
1 |
JAMA-Journal of the American Medical Association |
21.455 |
22 |
1 |
Journal of Clinical Investigation |
14.307 |
44 |
1 |
Proceedings of the National Academy of Sciences |
10.272 |
81 |
1 |
Cancer Research |
8.649 |
105 |
1 |
FASEB Journal |
7.172 |
149 |
1 |
Journal of Allergy and Clinical Immunology |
6.831 |
162 |
1 |
Advanced Drug Delivery Reviews |
6.588 |
170 |
1 |
Critical Care Medicine |
4.195 |
353 |
1 |
Journal of Leukocyte Biology |
4.180 |
357 |
Total = 254 |
|
|
Immediacy Index
The journal Immediacy Index is a measure of how quickly the average article in a journal is cited. It indicates how often articles published in a journal are cited within the year they are published. The Immediacy Index is calculated by dividing the number of citations to articles published in a given year by the number of articles published in that year.
Table 15 indicates the number of EPA papers published in the top 10% of journals, based on the JCR Immediacy Index. Two-hundred sixty-seven (267) of the 904 papers appear in the top 10% of journals, representing 29.5% of EPAs PM papers.
Table 15. PM Papers in Top 10% of Journals by JCR Immediacy Index
EPA Papers in that Journal |
Journal |
Immediacy Index |
JCR II Rank |
64 |
Environmental Health Perspectives |
0.869 |
304 |
52 |
Journal of Geophysical Research - Atmospheres |
0.827 |
334 |
26 |
American Journal of Physiology-Lung Cellular and Molecular Physiology |
0.654 |
496 |
20 |
Epidemiology |
0.938 |
264 |
19 |
Journal of Aerosol Science |
0.686 |
462 |
17 |
American Journal of Respiratory Cell and Molecular Biology |
0.623 |
546 |
17 |
American Journal of Respiratory and Critical Care Medicine |
2.461 |
56 |
7 |
Analytical Chemistry |
0.657 |
493 |
5 |
Circulation |
1.946 |
82 |
4 |
Journal of Immunology |
0.988 |
239 |
4 |
Philosophical Transactions of the Royal Society of London Series A-Mathematical Physical and Engineering Sciences |
0.867 |
305 |
4 |
Journal of Biological Chemistry |
1.231 |
160 |
3 |
American Journal of Epidemiology |
0.908 |
281 |
3 |
Free Radical Biology and Medicine |
0.712 |
432 |
3 |
Thorax |
1.237 |
158 |
3 |
Science |
5.589 |
12 |
2 |
Biometals |
0.717 |
424 |
2 |
Lancet |
5.826 |
10 |
1 |
Journal of Chemical Physics |
0.661 |
487 |
1 |
Journal of Clinical Investigation |
2.946 |
41 |
1 |
Critical Care Medicine |
1.103 |
192 |
1 |
Journal of Allergy and Clinical Immunology |
1.465 |
123 |
1 |
Journal of Leukocyte Biology |
0.671 |
473 |
1 |
Cancer Research |
0.935 |
268 |
1 |
FASEB Journal |
1.247 |
154 |
1 |
New England Journal of Medicine |
11.719 |
2 |
1 |
Advanced Drug Delivery Reviews |
0.805 |
352 |
1 |
Proceedings of the National Academy of Sciences |
1.935 |
83 |
1 |
American Journal of Industrial Medicine |
0.616 |
552 |
1 |
JAMA-Journal of the American Medical Association |
6.048 |
9 |
Total = 267 |
|
|
Hot Papers
ESI establishes citation thresholds for hot papers, which are selected from the highly cited papers in different fields, but the time frame for citing and cited papers is much shorterpapers must be cited within 2 years of publication and the citations must occur in a 2-month time period. Papers are assigned to 2-month periods and thresholds are set for each period and field to select 0.1% of papers. There were no hot papers identified for the current 2-month period (i.e., January-February 2005), but there were a number of hot papers identified from previous periods.
Using the hot paper thresholds established by ESI as a benchmark, 17 hot papers, representing 1.9% of the PM papers, were identified in four fieldsClinical Medicine, Geosciences, Environment/Ecology, and Engineering. The hot papers are listed in Table 16.
Table 16. Hot Papers Identified Using ESI Thresholds
Field |
ESI Hot Papers Threshold |
No. of Cites in 2-Month Period |
Paper |
Clinical Medicine |
12 |
15 cites in November-December 2003 |
Pope CA, et al. Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution. JAMAJournal of the American Medical Association 2002;287(9):1132-1141. |
Geosciences |
10 |
10 cites in June-July 2004 |
Orsini DA, et al. Refinements to the particle-into-liquid sampler (PILS) for ground and airborne measurements of water soluble aerosol composition. Atmospheric Environment 2003;37(9-10):1243-1259. |
Environment/ Ecology |
8 |
9 cites in May-June 2004 |
Li N, et al. Ultrafine particle pollutants induce oxidative stress and mitochondrial damage. Environmental Health Perspectives 2003;111(4):455-460. |
9 |
9 cites in September-October 2002 |
Laden F, et al. Association of fine particulate matter from different sources with daily mortality in six US cities. Environmental Health Perspectives 2000;108(10):941-947. |
|
8 |
9 cites in April-May 2004 |
Lioy PJ, et al. Characterization of the dust/smoke aerosol that settled east of the World Trade Center (WTC) in Lower Manhattan after the collapse of the WTC 11 September 2001. Environmental Health Perspectives 2002;110(7):703-714. |
|
7 |
7 cites in September- October 2003 |
Jang MS, Kamens RM. Atmospheric secondary aerosol formation by heterogeneous reactions of aldehydes in the presence of a sulfuric acid aerosol catalyst. Environmental Science & Technology 2001;35(24):4758-4766. |
|
3 |
4 cites in July-August 2000 |
Stolzenburg MR, Hering SV. Method for the automated measurement of fine particle nitrate in the atmosphere. Environmental Science & Technology 2000;34(5):907-914. |
|
Engineering |
4 |
4 cites in July 2002 |
Long CM, et al. Characterization of indoor particle sources using continuous mass and size monitors. Journal of the Air & Waste Management Association 2000;50(7):1236-1250. |
Engineering |
4 |
4 cites in May-June 2002 |
Jayne JT, et al. Development of an aerosol mass spectrometer for size and composition analysis of submicron particles. Aerosol Science and Technology 2000;33(1-2):49-70. |
4 |
4 cites in May 2002 |
Mallina RV, et al. High speed particle beam generation: a dynamic focusing mechanism for selecting ultrafine particles. Aerosol Science and Technology 2000;33(1-2):87-104. |
|
4 |
4 cites in November-December 2001 |
Christoforou CS, et al. Trends in fine particle concentration and chemical composition in Southern California. Journal of the Air & Waste Management Association 2000;50(1):43-53. |
|
4 |
4 cites in June-July 2002 |
Sarnat JA, et al. Assessing the relationship between personal particulate and gaseous exposures of senior citizens living in Baltimore, MD. Journal of the Air & Waste Management Association 2000;50(7):1184-1198. |
|
4 |
4 cites in February-March 2003 |
McMurry PH, et al. The relationship between mass and mobility for atmospheric particles: a new technique for measuring particle density. Aerosol Science and Technology 2002;36(2):227-238. |
|
5 |
6 cites in April-May 2004 |
Zhu YF, et al. Concentration and size distribution of ultrafine particles near a major highway. Journal of the Air & Waste Management Association 2002;52(9):1032-1042. |
|
4 |
4 cites in April-May 2004 |
Offenberg JH, et al. Persistent organic pollutants in the dusts that settled across lower Manhattan after September 11, 2001. Environmental Science & Technology 2003;37(3):502-508. |
|
3 |
4 cites in November 2004 |
Canagaratna MR, et al. Chase studies of particulate emissions from in-use New York City vehicles. Aerosol Science and Technology 2004;38(6):555-573. |
|
3 |
4 cites in November-December 2004 |
Drewnick F, et al. Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer, Part I: mass concentrations. Aerosol Science and Technology 2004;38(Suppl 1):92-103. |
Author Self-Citation
Self-citations are journal article references to articles from that same author (i.e., the first author). Because higher author self-citation rates can inflate the number of citations, the author self-citation rate was calculated for the PM papers. Of the 9,578 total cites, 537 are author self-citesa 5.6% author self-citation rate. Garfield and Sher2 found that authors working in research-based disciplines tend to cite themselves on the average of 20% of the time. MacRoberts and MacRoberts3 claim that approximately 10% to 30% of all the citations listed fall into the category of author self-citation. Therefore, the 5.6% self-cite rate for the PM papers is below the range for author self-citation.
1 Thomsons Web of Science provides access to current and retrospective multidisciplinary information from approximately 8,700 of the most prestigious, high impact research journals in the world. Web of Science also provides cited reference searching.
2 Garfield E, Sher IH. New factors in the evaluation of scientific literature through citation indexing. American Documentation 1963;18(July):195-201.
3 MacRoberts MH, MacRoberts BR. Problems of citation analysis: a critical review. Journal of the American Society of Information Science 1989;40(5):342-349.