Which will not cause atmospheric pollution ?

Options

A. `SO_(2)`
B. `CO_(2)`
C. CO
D. `H_(2)`.

Answer

D

Explanation

`CO_(2)` has little pollution value at concentration present in air. It is more of a green houses gas. Rather in excess found at ground level, `CO_(2)` is useful for higher level of photosynthesis. It is more common in soil where it inhibits root growth.