PM (particulate matter)
NAAQS (
current
;
historic
)
primary
1-hr
100 ppb
__ mcg/m
3
98th percentile averaged over 3 years
(more than one-per-day allowed?)
pri. & sec.
annual
53 ppb
__ mcg/m
3
annual mean
Attainment demonstration for ozone, haze, and pm2.5 (2007)
Guidance for PM2.5 permit modeling (May, 2014)
Draft guidance for PM2.5 permit modeling (March, 2013)
Transportation conformity guidance for hot-spot analysis (December, 2010) (gone missing)
;
(appendices)
Vacatur and remand of Significant Impact Level (SIL) and Significan Monitored Concentration (SMC) provisions of
40 CFR 51.166(k)(2)
and
40 CFR 52.21(k)(2)
SIL's for PM2.5 - Q & A (March 4, 2013)
D. C. Court of Appeals Sierra Club vs. USEPA No. 10-1413 opinion Jan. 22, 2013
Attainment status
old standard
current standard
attainment
unclassifiable
nonattainment
(
back
)