| Pollutant |
Current Primary Standarda |
Revised Primary
Standarda |
| Ozone |
1-Hour
0.12 ppm |
To attain this standard, the daily maximum
1-hour average concentration measured by a continuous ambient air
monitor must not exceed 0.12 ppm more than once per year, averaged
over 3 consecutive years. |
8-Hour
0.08 ppm |
To attain this standard, the 3-year
average of the fourth-highest daily maximum 8-hour average of
continuous ambient air monitoring datab over each year
must not exceed 0.08 ppm. |
Particulate Matter
Up to 10 Microns in
Diameter (PM10) |
Annual
50 µg/m3 |
To attain this standard, the arithmetic
average of the 24-hour samples for a period of 1 year, averaged over
3 consecutive years, must not exceed 50 µg/m3. |
Annual
50
µg/m3 |
Same as existing standard for
PM10. |
| |
24-hour
150 µg/m3 |
To attain this standard, the concentration
of samples taken for 24-hour periods at each monitor within an area
must not exceed 150 µg/m3, more than once per
year, averaged over 3 years. |
24-hour
150 µg/m3 |
To attain this standard, the 99th
percentilec of the distribution of the 24-hour
concentrations for a period of 1 year, averaged over 3 years, must
not exceed 150 µg/m3 at each monitor within an
area. |
| Particulate Matter Up to 2.5 Microns in
Diameter (PM2.5) |
|
No current standard. |
Annual
15 µg/m3 |
To attain this standard, the 3-year
average of the annual arithmetic mean of the 24-hour concentrations
from single or multiple population oriented monitorsd
must not exceed 15.0 µg/m3. |
| |
|
No current standard. |
24-hour
65 µg/m3 |
To attain this standard, the 98th
percentile of the distribution of the 24-hour concentrations for a
period of 1 year, averaged over 3 years, must not exceed 65
µg/m3 at each monitor within an
area. |
