Consider the following statements regarding SMOG:
1. SMOG was coined during the 1950's to describe a mixture of smoke and fog experienced in London
2. The principal pollutants in London SMOG are particulates and sulphur compounds
3. The London SMOG occurs generally early in the morning on cold wet winter days
Which of the above statements are correct?
1
1, 2 and 3
2
1 and 2 only
3
1 and 3 only
4
2 and 3 only