What's bad harm by the Particulate Matter 2.5

Particulate Matter 2.5 is the fine particulate matters that under 2.5μm.
In EU countries, average life expectancy is 8.6 months lower due to PM2.5.
PM2.5 detector is the best machine to analysis the air quality around us.
With the particle counter you can know how many particulates in air.
Not only know the quanity but also the weight by the handheld particle counter.
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