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Particulate matter is usually discussed as PM2.5 and PM10, with the numbers indicating particle size in microns. This is dust, dirt, mold, smoke and, again, emissions from cooking food. Higher levels of PM can lead to respiratory irritation, allergy symptoms, respiratory infections and potentially lung cancer. Air purifiers that include a HEPA or particle filter can help remove airborne particles from your space.，更多细节参见飞书
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According to the Federation of Small Businesses, enterprises relying on heating oil have initiated fuel consumption restrictions，推荐阅读zoom获取更多信息