WHO confirm PM2.5 would cause cancer

Fine particulate matter which is a small particulate matter in the air.
We can not see it but it is very bad to human body, so there have PM2.5 detector now.
It now called handheld particle counter which test air quality.
On October 17, 2013, the world health organization affiliated to report the international agency for research on cancer.
First identify air pollution cause cancer in humans, and regard it as common and major environmental carcinogens.
So we need air purifier to clean the air and use PM2.5 detector to know the air quality.
 

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