What PM2.5 Actually Is — Size, Sources & Why It Enters Lungs
• PM2.5 consists of fine particles 2.5 micrometers or less in diameter, small enough to deeply penetrate the lungs.
• Major PM2.5 sources include combustion from vehicles and industrial processes, as well as natural events like wildfires.
• Exposure to PM2.5 can cause respiratory and cardiovascular problems, emphasizing the importance of monitoring air quality and taking protective measures.
Understanding PM2.5: Size, sources, health impacts
PM2.5 refers to fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller. To put that into perspective, a human hair is about 70 micrometers in diameter – making PM2.5 roughly 30 times smaller! This tiny size is precisely what makes PM2.5 so dangerous to human health.
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