what are pm 2.5 particles ?

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https://www.epa.gov/pm-pollution/particulate-matter-pm-basics

https://www.epa.gov/pm-pollution/particulate-matter-pm-basics
Particulate Matter (PM) Basics | US EPA
11 juil. 2023Particle pollution includes: PM10 : inhalable particles, with diameters that are generally 10 micrometers and smaller; and PM2.5 : fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller. How small is 2.5 micrometers? Think about a single hair from your head.

https://www.cdc.gov/air/particulate_matter.html

https://www.cdc.gov/air/particulate_matter.html
Particle Pollution | Air | CDC
Fine (smaller) particles, called PM 2.5, are more dangerous because they can get into the deep parts of your lungs — or even into your blood. How can particle pollution affect my health? Particle pollution can affect anyone, but it bothers some people more than others.

https://www.cleanairresources.com / resources / what-is-pm-2-point-5-and-why-does-it-matter

https://www.cleanairresources.com / resources / what-is-pm-2-point-5-and-why-does-it-matter
PM 2.5 – What does it mean, and why does it matter? – Clean Air Resources
One of the most minuscule categories of these airborne hazards are called particulate matter (PM) 2.5 ( see what the EPA says about PM 2.5 ). The Health effects of inhaling particulate matter have been widely studied in humans and animals and include asthma, lung cancer, and premature death.

https://ww2.arb.ca.gov/resources/inhalable-particulate-matter-and-health

https://ww2.arb.ca.gov/resources/inhalable-particulate-matter-and-health
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 PM2.5? PM10 and PM2.5 often derive from different emissions sources, and also have different chemical compositions.

https://en.wikipedia.org/wiki/Particulates

https://en.wikipedia.org/wiki/Particulates
Particulates – Wikipedia
Similarly, fine particulate matter (PM 2.5) tends to penetrate into the gas exchange regions of the lung (alveoli), and very small particles (ultrafine particulate matter PM 0.1) may pass through the lungs to affect other organs. Penetration of particles is not wholly dependent on their size; shape and chemical composition also play a part.

https://www.epa.gov/sites/production/files/2014-05/documents/huff-particle.pdf

https://www.epa.gov/sites/production/files/2014-05/documents/huff-particle.pdf
PDF Overview of Particle Air Pollution (PM2.5 and PM10)
•Particulate matter (PM), also called particle pollution, is a general term for extremely small particles and liquid droplets in the atmosphere •PM 2.5 (fine particles): d ≤ 2.5 m •PM 10 (coarse particles): d ≤ 10 m •Primary sources: -Incomplete combustion -Automobile emissions -Dust -Cooking •Secondary sources:

https://www.epa.gov/pmcourse/what-particle-pollution

https://www.epa.gov/pmcourse/what-particle-pollution
What is Particle Pollution? | US EPA
26 juin 2023Fine particles (also known as PM 2.5): particles generally 2.5 µm in diameter or smaller. This group of particles also encompasses ultrafine and nanoparticles which are generally classified as having diameters less than 0.1 µm. Note that PM 10 is a term that encompasses coarse, fine and ultrafine fractions.

https://en.wikipedia.org/wiki/Particulate_pollution

https://en.wikipedia.org/wiki/Particulate_pollution
Particulate pollution – Wikipedia
Average global distribution of particulate matter (PM2.5) concentrations (2001-2006). Atmospheric particulate matter, also known as particulate matter, or PM, describes solids and/or liquid particles suspended in a gas, most commonly the Earth ‘s atmosphere. [1]

https://www.canada.ca/en/health-canada/services/publications/healthy-living/infographic-fine-particulate-matter.html

https://www.canada.ca/en/health-canada/services/publications/healthy-living/infographic-fine-particulate-matter.html
Infographic: What is fine particulate matter (PM2.5)? – Canada.ca
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 or solid particles in aerosol, or biological matter like mould, bacteria, pollen and animal dander. PM 2.5 poses a risk to your health because, when …

https://www.epa.gov/pm-pollution/national-ambient-air-quality-standards-naaqs-pm

https://www.epa.gov/pm-pollution/national-ambient-air-quality-standards-naaqs-pm
National Ambient Air Quality Standards (NAAQS) for PM
29 mars 2023Currently, EPA has primary and secondary standards for PM 2.5 (annual average standards with levels of 12.0 µg/m 3 and 15.0 µg/m 3, respectively; 24-hour standards with 98th percentile forms and levels of 35 µg/m 3) and PM 10 (24-hour standards with one-expected exceedance forms and levels of 150 µg/m 3 ). Rule History Public Hearing lesoutrali bot