Consider the following pairs:
| Air pollutant | Effects on human health |
| 1. Aldehydes | Irritate nasal and respiratory tracts |
| 2. Hydrogen sulphides | Reduces oxygen-carrying capacity of the blood |
| 3. Sulphur dioxide | Chest constriction, Headache, Vomiting & death |
Which of the pairs given above is/are correctly matched?
1
1 and 2 only
2
2 and 3 only
3
1 and 3 only
4
1, 2 and 3