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It only takes .5 ppms of nitrogen dioxide in the air to increase viral uptake into cells......
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[quote:Sholomar:MV80MzM0OTA0Xzc4OTE5NzUwXzcxRkI1RDg4] Here's the best map I could find showing concentrations in the US. Living in eastern South Dakota I guess I'm in one of the "better" areas. https://www.nasa.gov/content/goddard/new-nasa-images-highlight-us-air-quality-improvement [/quote]
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