Environment

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Pollution is the addition of any substance to the environment in excess of what is normally present, making the environment impure.

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A pollutant is a substance or constituent in the wrong amount, at the wrong place, or at the wrong time. It harms the environment and living beings.

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Pollution is classified into air pollution, water pollution, soil pollution, and noise pollution.

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Oxygen is the most important component of air. Humans and animals breathe in oxygen and breathe out carbon dioxide. Plants take in carbon dioxide and give out oxygen during the day.

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Air pollution blocks the pores of leaves and restricts plant respiration. It also reduces sunlight for food making, so food production decreases.

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Smoke and dust are air pollutants. They irritate the respiratory system and can lead to bronchitis and asthma.

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Smog is formed when smoke and dust mix with fog. It reduces visibility and can cause accidents.

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Simran had chronic cold and cough for one year and suffered from bronchial asthma due to smoke and dust. Her health improved after shifting to a cleaner environment.