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| Column - $I$ | Column - $II$ |
| $(1)$ Nitrous oxide | $(a)$ Secondary pollutant from car exhaust. |
| $(2)$ Chlorofluorocarbons | $(b)$ Combustion of fossil fuels,wood etc. |
| $(3)$ Methane | $(c)$ Denitrification |
| $(4)$ Ozone | $(d)$ Refrigerators,aerosols,sprays |
| $(5)$ Carbon dioxide | $(e)$ Cattle,rice fields,toilets |
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