Q. Which among the following is / are principal components of photochemical smog in urban areas?

1. Oxides of Nitrogen
2. Hydrocarbons
3. Ozone
4. Suspended Particulate Matter

Select the correct option from the codes given below:
Answer: 1, 2, 3 & 4
Notes: All are principal components of photochemical smog.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.