Question

which of the following substances, when present in air, causes air pollution?
water vapour, carbon monoxide, lead, carbon dioxide, sulphur dioxide,CFCs,nitrogen,oxygen

Answer 1

This occurs when chemical reactions in the atmosphere produce or destroy greenhouse gases, including tropospheric ozone. ... Gases that cancause these indirect effects includecarbon monoxide (CO), oxides ofnitrogen (NOx) and non-methane volatile organic compounds (NMVOC).

Answer 2

》Carbon Monoxide,sulphur dioxide,CFC's......