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National Ambient Air Quality Standards

https://www.wikidata.org/wiki/Q6970339

Field Hierarchy

Parent
Biology 35.7M papers	Physics 32.4M papers	Chemistry 29.1M papers	Organic chemistry 13.1M papers
Geography 11.5M papers	Ecology 8M papers	Meteorology 2.7M papers	Pollution 216k papers
Pollutant 156k papers		Air pollution 106k papers
Current
National Ambient Air Quality Standards 1,133 papers
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