The explanations of handheld particle counter.

Fine particulate matter diameter below 2.5μm we call it pm2.5, diameter under 10μm we call it pm10
Handheld particle counter is for pm2.5 and pm10 detecting.
WHO index pm2.5 value under 10 is a safe range.
Also pm2.5 is the main reason as air purifier, a lot of countries make up the pm2.5 standard,
it will be the first step to protect air quality.

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