11
Particulate Matter
lParticulate matter (PM)
is complicated by several factors
nMany different particle sizes
nDifferent sources
nDifferent composition
n
n
n
lTwo air quality standards
nPM10 (Coarse):  < 10 µm
nPM2.5 (Fine): < 2.5 µm
l
human hair
(100 µm)
10 µm PM
2.5 µm PM