Particulate Matter (PM) Basics | US EPA
Size comparisons for PM particles. PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye.
What Is Pm, and How Does It Get Into The Air?Size Comparisons For PM ParticlesPM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air....What Are The Harmful Effects of Pm?Particulate matter contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. Par...What Is Being Done to Reduce Particle Pollution?EPA regulates inhalable particles. Particles of sand and large dust, which are larger than 10 micrometers, are not regulated by EPA. EPA's national...