The specific PM categories of PM10 and PM2.5 have been historically identified by national governments as important monitoring levels in order to assess the quality of the air we breathe, , because PM10 particles irritate exposed mucous such as the eyes and throat and PM2.5 particles travel all the way through the lungs into the alveoli. For example, PM2.5 defines inhalable particles with a diameter of generally 2.5 micrometers and smaller, PM10 particles with a diameter of 10 micrometers and smaller, and so forth.
Different PM categories are usually reported under the common nomenclature of PMx, where ‘x’ defines the maximum particle diameter in the airborne particle mixture or ‘aerosol’. shape, optical properties, size and composition ¬– but it is most commonly divided into sub-categories based on the particle size information. PM includes particles with different characteristics – i.e. Particulate Matter, abbreviated as ‘PM’, is a mixture of airborne solid particles and liquid droplets that can be inhaled and may cause serious health problems.
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