Particulate Matter (PM) Basics | US EPA - U.S. Environmental ...
2024年6月20日 · Some particles less than 10 micrometers in diameter can get deep into your lungs and some may even get into your bloodstream. Of these, particles less than 2.5 …
PM2.5 Explained - Indoor Air Hygiene Institute
PM2.5 is used when describing pollutant levels both outdoor and indoor, where health impact from exposure considers amount of PM2.5 over a 24-hour period. Most studies indicate PM2.5 at or …
National Ambient Air Quality Standards (NAAQS) for PM
2024年12月19日 · EPA is setting the level of the primary (health-based) annual PM 2.5 standard at 9.0 micrograms per cubic meter to provide increased public health protection, consistent …
Health and Environmental Effects of Particulate Matter (PM)
2024年7月16日 · Fine particles (PM 2.5) are the main cause of reduced visibility (haze) in parts of the United States, including many of our treasured national parks and wilderness areas. Learn …
Particulate pollution - Wikipedia
Particulate matter (PM) is generally classified into two main size categories: PM 10 and PM 2.5. PM 10, also known as coarse particulate matter, consists of particles 10 micrometers (μm) and …
What is PM2.5 and Why You Should Care - Bliss Air
PM2.5 refers to atmospheric particulate matter (PM) that have a diameter of less than 2.5 micrometers, which is about 3% the diameter of a human hair. Commonly written as PM 2.5, …
What is PM 2.5 and What Does it Mean for Indoor Air Quality?
2024年9月30日 · But PM 2.5, also known as fine particles, has the potential to penetrate deep into the lungs and contribute to health problems. PM 2.5 can enter indoor environments from …