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Filtered air includes trace amounts of many other chemical compounds.

Many substances of natural origin may be present in locally and seasonally variable small amounts as aerosols in an unfiltered air sample, including dust of mineral and organic composition, pollen and spores, sea spray, and volcanic ash.

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.

The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).

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Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.The three major constituents of Earth's atmosphere, are nitrogen, oxygen, and argon.Water vapor accounts for roughly 0.25% of the atmosphere by mass.Mr Mc Carthy, 50, said: ‘I’ve been told if someone causes an accident by obeying the legal speed limit through the village, then it’s my fault.That’s madness.’ The interior designer, who had a welder friend make the £250 device out of scrap metal, said: ‘It’s just the job.’Nottinghamshire County Council has refused on the grounds that the village – a scattering of around 20 properties along the main Newark to Ollerton road – does not meet its criteria for the lower limit.

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