Answer. Primary pollutants are the Waste or exhaust products driven out because of combustion of fossil fuels and organic matter. These are oxides of sulphur (SO2 and SO3); oxides of carbon (CO2 and CO); oxides of nitrogen (especially nitric oxide NO); hydrocarbon (CH4); ammonia and compounds of fluorine.
Secondary pollutants are produced by various reactions of primary pollutants. These are sulphuric acid, carbonic acid, nitric acid, hydrofluoric acid, ozone arid peroxy acetyl nitrate (PAN).