Global Air Quality Guidelines (AQGs) 2021 specify limits for which of the following pollutants?
1. Particulate Matter 2.5
2. Nitrogen Dioxide
3. Sulphur Dioxide
4. Carbon Dioxide
5. Carbon Monoxide
Select the correct answer by using the codes given below.
1
1, 2, 3 and 5 only
2
1, 2 and 4 only
3
3, 4 and 5 only
4
1, 2, 3, 4 and 5