where is PM 2.5

What is PM2.5? How does PM 2.5 penetrate into human body?

What is PM2.5? PM2.5 in particular and dust particles in general is particles which float in air with extremely small diameter and too hard to see by naked eye. Due to come from human activities or nature, dust particles always exist anywhere in parallel with our lives. What is PM2.5? P.M2.5 is the concept that […]

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