Which of the following factors contribute to formation of photochemical smog?
1. Stable atmosphere
2. NOx 3. Solar insolation
4. CO
(a) 1, 2, 3, & 4 (b) 2, 3 & 4 only (c) 1 & 4 only (d) 1, 2 and 3 only
1. Stable atmosphere
2. NOx 3. Solar insolation
4. CO
(a) 1, 2, 3, & 4 (b) 2, 3 & 4 only (c) 1 & 4 only (d) 1, 2 and 3 only