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| કોલમ $I$ | કોલમ $II$ |
|---|---|
| $A$. $SO_2$ | $I$. ફોટોકેમિકલ સ્મોગ |
| $B$. $PAN$ | $II$. એસિડ વર્ષા |
| $C$. ધુમાડો | $III$. સ્ટ્રેટોસ્ફેરિક પ્રદૂષક |
| $D$. $CF_2Cl_2$ | $IV$. રજકણો (Particulate) |
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