Particulate Matter (PM) Basics | US EPA
May 30, 2025 · Of these, particles less than 2.5 micrometers in diameter, also known as fine particles or PM 2.5, pose the greatest risk to health. Fine particles are also the main cause of …
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, …
PM2.5, Explained: Why It’s the Most Dangerous Thing You’re …
Oct 3, 2025 · PM2.5 is a group of particulate matter with a diameter of 2.5 microns or less. Often referred to as fine particulate matter or soot, these microscopic particles usually remain …
What is PM 2.5 and What Does it Mean for Indoor Air Quality?
PM is a complex mixture of tiny particles and liquid droplets in the air. It is measured in sizes, such as PM10 and PM2.5. PM10 includes things like dust, pollen, and mold, while PM2.5 …
What is PM2.5? - Clean Air Initiative
2 days ago · PM2.5 is one of the most serious air pollutants due to its microscopic size and ability to penetrate deep into the body. Understanding PM2.5 helps you make informed decisions …
Particulate Matter | Air Quality
Nov 13, 2025 · Despite significant progress on reducing PM 2.5, wildfires are an infrequent, but significant source of PM 2.5 that can expose large populations to unhealthy levels of trace gases.
What Causes PM2.5 Pollution and How Does It Form?
Particulate matter 2.5, commonly known as PM2.5, is a significant air pollutant. Understanding its origins and formation is important for comprehending its impact on air quality and public …
Inhalable Particulate Matter and Health (PM2.5 and PM10)
Fine particulate matter is defined as particles that are 2.5 microns or less in diameter (PM2.5). Therefore, PM2.5 comprises a portion of PM10. What is the Difference Between PM10 and …
What Is PM2.5 Pollution? - The Institute for Environmental …
Jun 18, 2025 · PM2.5 pollution refers to particulate matter with a diameter of 2.5 micrometers or less, tiny inhalable particles so small they can penetrate deep into the lungs and even enter …
Understanding PM2.5 and PM10: Particulate Matter in the Air
Particulate Matter (PM) refers to tiny particles or droplets in the air that can be inhaled into the respiratory system. They are categorized by their size, which directly impacts their health …