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Air - Simple English Wikipedia, the free encyclopedia Air can be polluted by some gases (such as carbon monoxide, hydrocarbons, and nitrogen oxides), smoke, and ash This air pollution causes various problems including smog, acid rain and global warming
Air | Composition, Oxygen, Nitrogen | Britannica Air, mixture of gases comprising the Earth’s atmosphere The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both space and time
AIR Definition Meaning - Merriam-Webster The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object (such as a planet)
Air - National Geographic Society Air is the invisible mixture of gases that surrounds Earth Air contains important substances, such as oxygen and nitrogen, that most species need to survive
AIR在劍橋英語詞典中的解釋及翻譯 - Cambridge Dictionary air noun (BROADCAST) be on off (the) air C1 If a programme or a person is on off (the) air, they are are not broadcasting on radio or television: The radio station is on air from 6 a m