| Pollutant | [1] | [2] | [3] | [4] | ||
| PM2.5 | 10 µg/m3, annual average 25 µg/m3, 24 hour average | 25 μg/m3, annual average | 45 μg/m3 24 hour average, 12 μg/m3, annual average | Daily average, 35 μg/m3, 98 percentile, 3 years over average 12 μg/m3 hour average, 3 years over average | ||
| PM10 | 20 µg/m3, annual average 50 µg/m3, 24 hour average | 40 μg/m3, annual average 50 μg/m3 not to be exceeded more than 35 times at a civil year, 24 hours average | 24 hour limit value: 75 μg/m3, 24 hours average, and Annual limit: 40 μg/m3, annual average | 150 μg/m3 Not to be exceeded once a year, average more than 3 years | ||
| Ozone (O3) | 100 µg/m3, 8 hours average | 180 µg/m3, hourly average 120 µg/m3 Daily maximum from 8-hour average in a civil year | 0.095 ppm or 186.2 µg/m3 hourly average. 8-hour average (O3), must be less than 0.070 ppm or 137.2 µg/m3, maximum once in one civil year. | 0.075 ppm, 147 µg/m3 8-hour average | ||
| Nitrogen Dioxide (NO2) | 40 µg/m3, annual average 200 µg/m3, hourly average | 200 µg/m3 Not to be exceeded more than 18 times in a civil year, hourly average 40 µg/m3, annual average | 0.21 ppm equal to 395 μg/m3, one hour once a year | Hourly average, 191.3 μg/m3, 98 percentile daily hourly average concentrations in more than 3 years. 101.4 μg/m3, annual average | ||
| Sulphur Dioxide (SO2) | 20 µg/m3, 24 hour average 500 µg/m3, 10 minutes average | 350 μg/m3, Not to be exceeded more than 24 times in a civil year, hourly average. 125 μg/m3 Not to be exceeded more than 18 times in a civil year, daily average | 288 μg/m3 or 0.110 ppm 24 hours average, once a year. 66 μg/m3 or 0.025 ppm annual average. 524 μg/m3, 8 hours average, not to be exceeded twice a year | 199.7 μg/m3 99 percentile, hourly daily concentration, 3 years over average | ||