1. Acid rain is rain with a pH of less than 5 due to dissolution of sulphur dioxide. nitrogen oxides and hyrochloric acid in it.

    Acid rain is rain with a pH of less than 5 due to dissolution of sulphur dioxide. nitrogen oxides and hyrochloric acid in it.

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  2. Smog is opaque dark brown or greyish mist occurring in cold weather reducing visibility and affecting living organisms.

    Smog is opaque dark brown or greyish mist occurring in cold weather reducing visibility and affecting living organisms.

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  3. Air pollution is degradation of the quality of air due to addition of natural or human made particulate matter, gases and vapours that have an adverse effect on humans, animals and vegetation.

    Air pollution is degradation of the quality of air due to addition of natural or human made particulate matter, gases and vapours that have an adverse effect on humans, animals and vegetation.

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  4. Rain gauge is an instrument for measuring the amount of rainfall.

    Rain gauge is an instrument for measuring the amount of rainfall.

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