lCoarse particles, PM10
nNAAQS: 150 µg/m3 (24-hr),
50 µg/m3 (annual)
nMajor sources
•Windblown dust
•Earthmoving
nEffects
•Cardiovascular distress
•Respiratory distress
•Visibility impairment
nTrends
•U.S. average PM10 down 30% (over past 20 years)
•While exceedances exist elsewhere,
the Mid-Atlantic U.S. has few
problems
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lFine particles, PM2.5
nNAAQS: 35 µg/m3 (24-hr),
15 µg/m3 (annual)
nMajor sources
•Diesel engines
•Power plants
nEffects
•Cardiovascular distress
•Respiratory distress
•Visibility impairment
nTrends
•U.S. average PM2.5 is down 10% (over past 5 years)
•Numerous areas exceed standard in
the East, particularly the DC to Boston
urban corridor
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