(a) Why have some countries banned indoor smoking?
(b) Two impurities present in sewage?
(c) Harmful effects of carbon monoxide, sulphur dioxide and oxides of nitrogen.

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Solution

(b) Impurities present in Sewage are:
Human waste
Surface run off of detergents, insecticides and herbisides, petroleum hydrocarbons, ammonia from food processing waste, fertilizers containing nutrients (nitrates and phosphates)
Industrial wastes which includes heavy metals
Oil spills etc.

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(a) Why have some countries banned indoor smoking?(b) Two impurities present in sewage?(c) Harmful effects of carbon monoxide, sulphur dioxide and oxides of nitrogen.

(b) Impurities present in Sewage are:Human wasteSurface run off of detergents, insecticides and herbisides, petroleum hydrocarbons, ammonia from food processing waste, fertilizers containing nutrients (nitrates and phosphates)Industrial wastes which includes heavy metalsOil spills etc.

(a) Why have some countries banned indoor smoking?
(b) Two impurities present in sewage?
(c) Harmful effects of carbon monoxide, sulphur dioxide and oxides of nitrogen.

(b) Impurities present in Sewage are:
Human waste
Surface run off of detergents, insecticides and herbisides, petroleum hydrocarbons, ammonia from food processing waste, fertilizers containing nutrients (nitrates and phosphates)
Industrial wastes which includes heavy metals
Oil spills etc.