Pollutants | Time average | Limit Values (en∙µg∙m−3) | ||
WHO guidelines | NS-05-062 (2003) | NS-05-062 (2019) | ||
SO2 | 10 minutes | 500 | - | 500 |
Daily | 20 | 125 | 50 | |
NO2 | 1 Hour | 200 | 200 | 200 |
Annual | 40 | 40 | 40 | |
O3 | 8 Hours | 100 | 120 | 100 |
CO | 1 Hour | 30,000 | - | 30,000 |
8 Hours | 10,000 | 30,000 (24 h) | 10,000 | |
PM10 | Daily | 50 | 260 | 150 |
Annual | 20 | 80 | 40 | |
PM2.5 | Daily | 25 | - | 75 |
Annual | 10 | - | 25 | |
Lead (Pb) | Annual | 0.5 - 1.0 | 2 | 0.5 |