Table 2.
National Environmental Quality Standards.
| Pollutants | Time-weighted average | Concentration in Ambient Air | |
|---|---|---|---|
| Effective from July 1, 2010 | Effective from January 1, 2013 | ||
| Sulfur Dioxide (SO2) | Annual Average 24 h | 80μg/m3 120μg/m3 |
80μg/m3 120μg/m3 |
| Oxides of Nitrogen as (NO) | Annual average 24 h | 40μg/m3 40μg/m3 |
40μg/m3 40μg/m3 |
| Oxides of Nitrogen as (NO2) | Annual Average 24 h | 40 μg/m3 80 μg/m3 |
40 μg/m3 80 μg/m3 |
| O3 | 1 h | 180 μg/m3 | 130 μg/m3 |
| Suspended Particulate Matter (SPM) | Annual Average 24 h | 400 μg/m3 550 μg/m3 |
360 μg/m3 500 μg/m3 |
| Respirable Particulate Matter (PM10) | Annual Average 24 h | 200 μg/m3 250 μg/m3 |
120 μg/m3 150 μg/m3 |
| Respirable Particulate Matter (PM2.5) | Annual Average 24 h 1 h | 25 μg/m3 40 μg/m3 25 μg/m3 |
15 μg/m3 35 μg/m3 15 μg/m3 |
| Lead (Pb) | Annual Average 24 h | 1.5 μg/m3 2 μg/m3 |
1 μg/m3 1.5 μg/m3 |
| Carbon Monoxide (CO) | 8 h 1 h | 5 μg/m3 10 μg/m3 |
5 μg/m3 10 μg/m3 |
Source: National Environmental Quality Standards.