An air quality standard, as a human activity, refers to the formally established regulatory limits on concentrations of specific atmospheric pollutants, derived through policy processes that integrate scientific risk assessment, exposure modeling, and socio-economic considerations. These standards define permissible ambient levels or emission thresholds for contaminants such as particulate matter, ozone, nitrogen oxides, and sulfur dioxide to protect human health and the environment. Their development and revision typically involve expert review of epidemiological and toxicological data, public consultation, and impact analyses, followed by legal codification and implementation through monitoring networks, compliance mechanisms, and enforcement actions.
A study that assesses the effects of wildfires over two decades shows that wildfire smoke significantly raises ground-level ozone and contributes to excess deaths from wildfire smoke in the United States each year. The research, ...
Environment
May 11, 2026
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Air quality in Europe is improving but more effort is needed to reach the European Union's 2030 targets, the European Environment Agency (EEA) said in its annual report on Thursday.
Environment
Apr 30, 2026
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The Environmental Protection Agency is reconsidering whether facilities that recycle plastic chemically should be held to the same strict air pollution standards as incinerators.
Environment
Apr 15, 2026
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After hours spent in the thick pollution-choking parts of northern Thailand, Pon Doikam gets home and blows her burning nose to find blood clots spattered across the tissue.
Environment
Apr 3, 2026
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New modeling shows almost one in three Americans will routinely breathe air considered unhealthy for sensitive people by the year 2100 due to climate change, a seven-fold increase compared to the turn of the century.
Environment
Mar 31, 2026
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The 2025 Eaton fire's smoke did more than darken the sky: It generated a carbon monoxide and particulate matter surge that far exceeded Los Angeles County's average daily human-caused emissions, according to a new study led ...
Earth Sciences
Mar 14, 2026
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Californians have long dealt with wildfire smoke as a seasonal fact of life, but those fires have become more intense and frequent, raising the profile of wildfire smoke as a public health issue. Now, a study led by researchers ...
Earth Sciences
Mar 11, 2026
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Although plastic particles in the air are increasingly coming into focus, knowledge about their distribution and effects is still limited. Chemical analyses from Leipzig now provide details from Germany for the first time: ...
Environment
Mar 2, 2026
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Cities are rapidly becoming the defining residential space of human life. Over 55% of the global population lived in urban areas in 2018, a proportion projected to reach nearly 68% by 2050, according to the United Nations ...
Earth Sciences
Feb 27, 2026
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Fifteen years ago, Beijing's Liangma riverbanks would have been smog-choked and deserted in winter, but these days they are dotted with families and exercising pensioners most mornings.
Environment
Feb 17, 2026
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