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7.6 Primary versus secondary air pollutants (a) State the distinction between primary and secondary air pollutants. (b) What is the significance of this distinction

7.6 Primary versus secondary air pollutants (a) State the distinction between primary and secondary air pollutants. (b) What is the significance of this distinction for air quality engineering? (c) For each of the following pollutants, state whether they are primary, secondary, or both. Briefly justify your answers. (i) Soot (ii) HCHO (iii) NO

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