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қоршаған ауа сапасы стандарттары (ҚАСС)
Health- and welfare-based standards for outdoor air which identify the maximum acceptable average concentrations of air pollutants during a specified period of time. (See also CAAQS and NAAQS and Criteria Air Pollutant. ) For more information, please view our ambient air quality standards website.
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Құс жолының көпіршіктері
The two giant bubbles of high-energy gamma rays protruding from the Milky Way, each spanning 25,000 light-years across, roughly the size of the galaxy ...