The united states pm2.5 standard

Fine particulate matters are the main content of air pollution
Once matters less than 2.5 micron can be absorb by lung, if less than 0.3 macron might access to pulmonary alveoli, easy to cause cough.
Developing contries and developed countries with different standard.

USA standard as below:
less than 15.4μg/m3--- very good
15.4-44.4 μg/m3 --- good
44.4-65.4 μg/m3--- mild contamination
65.4-150.4 μg/m --- middle level pollution
150.4-250.4 μg/m --- serious contamination
As WHO standard, pm2.5 value less than 10 μg/m³ is safe value.
pm2.5 detector or we call it air particle counter can capture the accurate result about fine particulate matters



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