1 - Damage caused to the water, air, soil, etc by harmful substances or waste.
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2 - A hard black substance that is dug from the Earth and can be burned to produce heat or power.
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3 - Rain that contains large amounts of harmful chemicals as a result of burning substances such as coal and oil.
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4 - A mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health.
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5 - A chemical substance used to kill harmful insects, small animals, wild plants, and other unwanted organisms.
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6 - A form of garbage that is harmful to health of plants, animals or humans and requires careful disposal (eg. batteries or paint).
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7 - Human waste from toilets.
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