15. In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index? 
 

1. Carbon dioxide

2. Carbon monoxide
3. Nitrogen dioxide

4. Sulfur dioxide
5. Methane
 

Select the correct answer using the code given below.

1. 1, 2 and 3 only

2. 2, 3 and 4 only

3. 1, 4 and 5 only

4. 1, 2, 3, 4 and 

Correct Answer :

2, 3 and 4 only