Word smog is derived from smoke and fog. It is really a serious threat to humanity. Now a days the menace of smog is spreading very fast due to increasing air pollution.
In the days of winter due to heaviness of air pollutants could not escape and remain in the environment and it is really very chocking condition . So early morning walkers and people suffering from bronchitis and highly blood pressure patients are seriously affected. Fine knitted masks are advised to combat smog conditions.
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