Why laser particle counter always show air quality very good?

Developing countries and developed countries air quality standard is different, also most countries set up different standard as WHO.
Lanjia laser particle counter set up the air quality level basic on China, more suitable for Southeast Asia use.
For other countries need to set up the standard as matching countries project.
The pm2.5 and 0.3 micron value always accurate basic on the detecting result.
So judgement do not influence the result.
For someone selling air purifier, we new add a filtering rate tell people how many percent air quality increase after use air purifier.

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