| Effect of Gaseous Pollutants on Humans | ||
| Pollutants | Health effects | |
| 1 | Carbon Monoxide (CO) from gasoline cars, 2-wheelers, 3-wheelers | Fatal in large does; aggrivates heart disorders; effects central nervous system; impairs oxygen carrying capacity of blood |
| 2 | Nitrogen oxides (Nox) from diesel vehicles | Irritation of respiratory tract |
| 3 | Ozone | Eye, nose and throat irritation; risk asthmatics, children and those involved in heavy exercise |
| 4 | Lead (from petrol vehicles) | Extremely toxic : effects nervous system and blood; can impair mental development of children; causes hypertension |
| 5 | Hydrocarbons (HC) mainly from 2-wheelers, 3-wheelers | Drowsiness , eye irritation, coughing |
| 6 | Benzene | Carcinogenic |
| 7 | Aldehydes | Irritation of eyes, nose and throat, sneezing, coughing, nausea, breathing difficulties; carcinogenic in animals |
| 8 | Polycyclic aromatic hydrocarbons (PAH) from diesel vehicles | Carcinogenic |