What’s particular matter? why people call it PM2.5?

Let’s make some examples to explain what is particular matter.

There are three severe air pollution events:

Meuse Valley(Belgium,1930)

London fog(1952)

Los Angeles photochemical smog(1940s)

Fine particular matter is the main reason for this pollution,

particular matter diameter less than 2.5 μm over 75% will be absorb by human people

then reach our pulmonary alveoli, harm human health,

what’s more, high levels of pollution can affect the growth of human embryos

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