russia v us sulfur dioxide standards
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The entire 469-page document in Russian can be found at: http://publication.pravo.gov.ru/Document/View/0001202102030022
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Original source here: https://www.epa.gov/criteria-air-pollutants/naaqs-table Note there are only six so-called "criteria" pollutants for which NAAQS are set. The US EPA does regulate 187 other hazardous air pollutants, but under another section of the Clean Air Act, setting "technology-based" standards, for example, the regulations for handling asbestos.
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Original document here: https://apps.who.int/iris/handle/10665/345329 In September 2021, the WHO updated its guidelines for air pollution standards for the first time in 16 years.
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The online interactive map can be found here: https://www.who.int/tools/air-quality-standards But it currently does not include U.S. daily average standards.