PM2.5 are tiny particulate matter less than 2.5 micrometers in size, or about 1/30th the average width of a human hair. They can penetrate deep into the lungs, and measuring them is considered a more accurate reflection of air quality than other methods."Because these dust particles are relatively fine, they can be directly absorbed by the lung's tiny air sacs," Huang said. "The airway's ability to block the fine dust is relatively weak, and so bacteria and viruses carried by the dust can directly enter the airway."
Severe Beijing Smog Prompts Unusual Transparency
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