11
Particulate Matter
l
P
articulate matter
(PM)
is complicated by several factors
n
Many different particle sizes
n
Different sources
n
Different composition
n
n
n
l
Two air quality standards
n
PM
10
(Coarse):
< 10 µm
n
PM
2.5
(Fine): < 2.5 µm
l
human hair
(100 µm)
10 µm PM
2.5 µm PM