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Gas layer surrounding Earth
The atmosphere of Earth consists of a layer of mixed gas that is retained by gravity, surrounding the Earth's surface. It contains variable quantities of suspended aerosols and particulates that create weather features such as clouds and hazes. The atmosphere serves as a protective buffer between the Earth's surface and outer space. It shields the surface from most meteoroids and ultraviolet solar radiation, reduces diurnal temperature variation – the temperature extremes between day and night, and keeps it warm through heat retention via the greenhouse effect.
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SINGAPORE – Air quality in central Singapore continued to be in the unhealthy range late on Sept 27, though the 24-hour Pollutant Standards Index (PSI) readings for the east and west has dropped from ...
Air quality in Singapore worsens as PSI reaches unhealthy levels in central, eastern, and western regions with health advisories issued by NEA. Read more at straitstimes.com.
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