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This article doesn't really do what the title promises. It doesn't tell you about air pollutant concentrations so much as how to convert one unit to another. I think it needs to start with an overview of the topic and the units, maybe give examples of common pollutants and concentrations (which are often ppb - and therefore very low indeed), before going on to conversion, which is perhaps the least interesting and useful part of the topic for general readers? If the article were called "converting...", it would be fine. 45154james (talk) 06:02, 3 April 2022 (UTC)[reply]