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| Column-$I$ | Column-$II$ |
| $(a)$. Ozone thickness | $(i)$. $UV$ rays |
| $(b)$. $CFC$ | $(ii)$. Refrigerator |
| $(c)$. $El$ Nino effect | $(iii)$. Temperature increase |
| $(d)$. Skin cancer | $(iv)$. Dobson unit |
| Column $A$ | Column $B$ |
| $(a)$ Catalytic converter | $(i)$ Particulate matter |
| $(b)$ Electrostatic precipitator | $(ii)$ Carbon monoxide and nitrogen oxides |
| $(c)$ Earmuffs | $(iii)$ High noise level |
| $(d)$ Landfills | $(iv)$ Solid wastes |
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