Particulate Matter (PM) Basics | US EPA
May 30, 2025 · Particle pollution is the term for a mixture of solid particles and liquid droplets found in the air. These include "inhalable coarse particles," with diameters between 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?
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 outdoor sources …
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 …
Infographic: What is fine particulate matter (PM2.5)? - Canada
Fine Particulate Matter (also known as PM 2.5) are particles in the air that measure less than 2.5 micrometers (μm) in diameter, and typically consists of a mix of things like smoke, soot, liquid …
PM2.5 | State of Global Air
PM 2.5, or fine-particle air pollution, consists of airborne particles measuring less than 2.5 micrometers in aerodynamic diameter, and is most often produced as a result of combustion.
Particulate matter (PM2.5) – Check air quality – GOV.UK
PM2.5 is a particulate matter (PM) made of small particles of solids or liquids in the air. Learn the sources of PM2.5 and how exposure can impact health.
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 …
Air Pollution's Pm2.5: What It Is And Why It Matters
May 16, 2025 · PM2.5 refers to particulate matter that is 2.5 micrometres or less in diameter. It is a mixture of solid particles and liquid droplets found in the air. These particles are so small that …
Particle Pollution and Health
The term fine particles, or particulate matter 2.5 (PM 2.5), refers to tiny particles or droplets in the air that are 2 ½ microns or less in width. The largest PM 2.5 particles are about 30-times …