Page 95 - Fundamentals of Air Pollution 3E

II. Episode Control 65

TABLE 5-1
b c
United States Alert, Warning, and Emergency Level Criteria"' -
Alert level criteria
SO 2
3
800 /.ig/m (0.3 ppm), 24-hr average
PM 10
3
350 /tg/m , 24-hr average
CO
3
17mg/m (15 ppm), 8-hr average
Ozone
3
400 /xg/m (0.2 ppm), 1-hr average
NO 2
3
3
1130 /xg/m (0.6 ppm), 1-hr average; 282 pg/rn (0.15 ppm), 24-hr average
Warning level criteria
SO 2
3
1600 /Ag/m (0.6 ppm), 24-hr average
PM 10
3
420 /xg/m , 24-hr average
CO
3
34 mg/m (30 ppm), 8-hr average
Ozone
3
800 ptg/m (0.4 ppm), 1-hr average
NO 2
3
3
2260 /ig/m (1.2 ppm), 1-hr average; 565 /ig/m (0.15 ppm), 24-hr average
Emergency level criteria
SO 2
3
2100 /Ag/m (0.8 ppm), 24-hr average
PM 10
3
500 /Ag/m , 24-hr average
CO
3
46 mg/m (15 ppm), 8-hr average
Ozone
3
1000 /Ag/m (0.1 ppm), 1-hr average
NO 2
3
3
3000 /Ag/m (0.6 ppm), 1-hr average; 750 /Ag/m (0.15 ppm), 24-hr average
" 1992 Code of Federal Regulations, Title 40-Protection of Environment, Chapter
1—Environmental Protection Agency, Appendix L, Example Regulations for
Prevention of Air Pollution Emergency Episodes, 1.1 Episode Criteria, pp.
841-842.
b
There is no criterion for lead, due to the chronic nature of the health effects
of concern.
c
Note: Append to each entry: Meterological conditions are such that pollutant
concentrations can be expected to remain at the above levels for 12 or more
hours or increase, or in the case of ozone the situation is likely to reoccur within
the next 24 hours unless control actions are taken.