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| List-$I$ | List-$II$ |
| $(a)$ Carbon monoxide | $(i)$ Carcinogenic |
| $(b)$ Sulphur dioxide | $(ii)$ Metabolized by pyrus plants |
| $(c)$ Polychlorinated biphenyls | $(iii)$ Haemoglobin |
| $(d)$ Oxides of nitrogen | $(iv)$ Stiffness of flower buds |
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