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| Column $I$ | Column $II$ |
|---|---|
| $A$. $SO_2$ | $I$. Photochemical smog |
| $B$. $PAN$ | $II$. Acid rain |
| $C$. Smoke | $III$. Stratospheric pollutant |
| $D$. $CF_2Cl_2$ | $IV$. Particulate |
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