Key Risk Assumptions and Limitations

These bar charts depict risks associated with a single source sector (major, area and other, mobile onroad, and mobile nonroad sources), with background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract) and with all source sectors and background combined for each of the 29 carcinogens included in the national-scale assessment.
How to read the bar chart.

These bar charts depict the hazard quotient (HQs) associated with a single emissions source sector (major, area and other, mobile onroad, and mobile nonroad sources), with background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract) and with all source sectors and background combined for each pollutant included in the national-scale assessment that has noncancer health effects.
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These bar charts show numbers of people whose 1996 exposure exceeded set cancer risk levels from emissions associated with single emissions source sectors (major, area and other, mobile onroad, and mobile nonroad sources), from background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract) and from all source sectors and background combined for each of the 29 carcinogens included in the national-scale assessment.
How to read the bar chart.

These bar charts show the number of people whose 1996 exposure is estimated to exceed set hazard quotient levels from single emissions source sectors (major, area and other, mobile onroad, and mobile nonroad sources) from background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract) and from all source sectors and background combined for each pollutant included in the national-scale assessment that has noncancer health effects.
How to read the bar chart.

This bar chart depicts aggregate risks from 29 carcinogens associated with single emissions source sectors (major, area and other, mobile onroad, and mobile nonroad sources), with background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract), and with all source sectors and background combined.
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This bar chart depicts the numbers of people whose 1996 estimated exposure to 29 carcinogenic air toxics exceeded set cancer risk levels from various emission sources sectors (major, area and other, mobile onroad, and mobile nonroad sources), from background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract or), and from all source sectors and background combined.
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This bar chart depicts respiratory HIs aggregated across 8 pollutants that are from various emission sources sectors (major, area and other, mobile onroad, and mobile nonroad sources), from background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract or), and from all source sectors and background combined.
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This bar chart depicts the number of people whose estimated 1996 exposures to 8 respiratory irritant air toxics exceeded set respiratory hazard index levels from various emission sources sectors (major, area and other, mobile onroad, and mobile nonroad sources), from background exposure (defined as exposure that does not result from inventoried sources within 50 kilometers of the census tract or), and from all source sectors and background combined.
How to read the bar chart.