Air Pollution - SlideShare
Feb 12, 2017· SECONDARY AIR POLLUTANTS:- Secondary air pollutants are those which are produced in the air by the reaction of two or more primary pollutants. e.g. Ozone Formaldehyde Photochemical smog Peroxy acetyl nitrate (PAN) 12. CLASSIFICATION BASED ON STATES OF MATTER 1. Gaseous air pollutants 2.