How many different types of primary pollutants together contribute to about 90 per cent of the global air pollution? HomeAir Pollution MCQsHow many different types of primary pollutants together contribute to about 90 per cent of the global air pollution?Q. How many different types of primary pollutants together contribute to about 90 per cent of the global air pollution?ThreeFiveSevenNone of the aboveAnswer: (b) Five.
