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5 represent estimates of changes in area-wide ambient concentrations based on fixed site monitoring during the two time periods, versus a direct measure of personal exposures
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https://pmc.ncbi.nlm.nih.gov/articles/PMC3382057/
Measurements were averaged first by site and then by metropolitan area

Seasonal variations in microbial and physicochemical parameters of Nile

https://pmc.ncbi.nlm.nih.gov/articles/PMC12690835/
gov website belongs to an official government organization in the United States

An Approach to Assessing the Influence of Environmental and Occupational

https://pmc.ncbi.nlm.nih.gov/articles/PMC10718082/
gov website belongs to an official government organization in the United States

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https://pmc.ncbi.nlm.nih.gov/articles/PMC1247515/
Environmental Protection Agency (EPA) assesses the health hazards of chemical contaminants present in the environment

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https://pmc.ncbi.nlm.nih.gov/articles/PMC6675588/
Environmental Protection Agency (EPA) regularly produces estimates of the health benefits of regulations that reduce fine particles and ozone in air, sometimes amounting to billions of dollars annually (2)

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https://pmc.ncbi.nlm.nih.gov/about/userguide/
Answers to many common questions about PMC are available in the PMC FAQ

Politics v. science: How President Trump's war on science impacted

https://pmc.ncbi.nlm.nih.gov/articles/PMC8793038/
In a survey conducted by the Office of Inspector General for the Environmental Protection Agency (EPA), nearly 400 EPA scientists said they had observed violations of the agency's scientific integrity policy in the second half of 2018, but did not report them due to “fear of retaliation, belief that reporting would

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https://pmc.ncbi.nlm.nih.gov/articles/PMC6785234/
gov website belongs to an official government organization in the United States

Association between air pollution and coronary artery calcification

https://pmc.ncbi.nlm.nih.gov/articles/PMC5019949/
gov website belongs to an official government organization in the United States