particulate matter

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particulate matter

n. Abbr. PM
Material suspended in the air in the form of minute solid particles or liquid droplets, especially when considered as an atmospheric pollutant.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A general term for organic air pollutants measuring less than 10 µm in diameter, which are linked to increased respiratory morbidity and mortality.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

particulate matter



Small but discrete airborne or waterborne solids, such as fragments of ash, dust, pollen, or soot. They may be generated by the burning of fossil fuels, agricultural or construction projects, incineration, mining, and other natural and artificial processes. Higher levels of PM in air have been associated with increases in lung disease and mortality in exposed populations.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Different temperatures of the primary combustion air have impact on formation of gaseous emissions and particulate matter.
The new rules will be implemented amid advances in development of technologies such as the diesel particulate filter system to eliminate diesel particulate matter and nitrogen oxide.
You can learn more about airborne particulate matter pollution by visiting the EPA Web site,, or the San Joaquin Valley Air Pollution Control District's Web site,
The Environment Agency study shows that 90.1% of general residential areas monitored by the agency attained air quality standards set by the agency in terms of suspended particulate matter, a 22.8 percentage point increase from the previous year.
EPA said smog and particulate matter account for 15,000 premature deaths, one million respiratory problems, 400,000 asthma attacks, and thousands of cases of aggravated asthma.
Nowak's urban forest effects model, called UFORE-D, calculates how many grams of ozone, sulfur dioxide, nitrogen dioxide, and carbon monoxide are deposited in tree canopies each hour, as well as how much particulate matter smaller than 10 microns is deposited each day.
1904) that would place a moratorium on using the new standards for ozone and fine particulate matter under the Clean Air Act.
According to the Environmental Protection Agency (EPA), residential wood stoves are one of the nation's largest sources of particulate matter air pollution.
The particulate matter of 2.5 microns (PM2.5) ratio was witnessed to 12.53ug/mA3 against the NEQS of 35ugm/mA3.
The daily ambient air quality report recorded below permissible ratio of particulate matter (PM 2.5) and other hazardous environment pollutants' ratio.
Concentrations of Particulate Matter of size 2.5 microns was 31.4ug/m3 against the 35 ug/m3 standard value.

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