Question

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.
(a) 1, 2 and 3 only 

(b) 2, 3 and 4 only 

(c) 1, 4 and 5 only 

(d) 1, 2, 3, 4 and 5

Answer 1

(b) (i) The API level is based on the level of 6 atmospheric pollutants, namely sulfur dioxide (SO₂), nitrogen dioxide (NO₂), suspended particulates smaller than 10 μm in aerodynamic diameter (PM10), suspended particulates smaller than 2.5 μm in aerodynamic diameter (PM2.5), carbon monoxide (CO), and ozone (O₃) measured at the monitoring stations throughout. So by elimination we are left with option “b”.