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Question
Differentiate between primary pollutants and secondary pollutants.
Solution
| Primary pollutants | Secondary pollutants | ||
| 1 | They are emitted directly from the source. | 1 | They are not emitted directly from the source but are formed due to chemical reactions. |
| 2 | They are found in the atmosphere in the form in which they are emitted. | 2 | They are formed in the atmosphere by chemical reactions between primary pollutants and atmospheric constituents. |
| 3 | Ash, smoke, dust, radioactive compounds, oxides of sulphur, carbon and nitrogen are primary pollutants. | 3 | SO3, O3, hydrogen cyanide, peroxyacetyl nitrate, ketones etc. are secondary pollutants. |
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