Consider the following statements regarding air pollution:

Q. Consider the following statements regarding air pollution:

i. The pollutant caused by incomplete combustion of organic matter is carbon monoxide.

ii. Depletion of ozone in outer atmosphere may trigger skin cancer.

iii. Acid rains are caused by SO and NO

iv. The permissible standard for SO in air for residential areas in India is 80 μg/m .

Which of the above statements are correct?

1. i, iii and iv only
2. i, ii, iii and iv
3. i, ii and iii only
4. ii and iv only

Answer. i, ii, iii and iv