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• n  a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)
• a  composed of distinct particles

• According to Weschler, indoor pollution either seeps in from outside (such as particulate matter from car exhaust, ground-level ozone and noxious gases, like sulfur dioxide, which .
• Every tree that's subtracted from a city's ecosystem means some particulate pollution that should have been filtered out remains.
• But it's hard for the average city denizen to know when particulate levels reach that unhealthy zone.

• particulate matter

• nonparticulate

News & Articles

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• Urban trees remove fine particulate air pollution, save lives
  Biologists have estimated how much fine particulate matter is removed by trees in 10 cities, their impact on PM2.5 concentrations and associated values and impacts on human health.
  June 20, 2013 - Science Daily
• Contribution of particulate matter from air pollution to forest decline
  Air pollution is related to forest decline and also appears to attack the protecting wax on tree leaves and needles. Scientists have now discovered a responsible mechanism: particulate matter salt compounds that become deliquescent because of humidity and form a wick-like structure that removes water from leaves and promotes dehydration.
  June 19, 2013 - Science Daily
• Forest Decline Due to Particulate Matter
  Forests and plants in general can remove pollutants but may be at a hard cost. Air pollution is related to forest decline and also appears to attack the protecting wax on tree leaves and needles. Bonn University scientists have now discovered a responsible mechanism: particulate matter salt compounds that become deliquescent because of humidity and form a wick-like structure that removes water ...
  June 19, 2013 - Environmental News Network

Quotes

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• Eliot Spitzer in Bizjournals.com
  New York Attorney General Eliot Spitzer said the EPA is bound by law to review its standards for "fine particulate matter" every five years.
• Janez Potočnik in EnergyPortal.eu
  Environment Commissioner Janez Potočnik said: "Particulate matter in air pollution poses a serious risk to health. Strict standards are necessary to protect EU citizens. It is essential that these standards are fully respected in zones where time...
• Joe Gibbs in International Herald Tribune
  We are thrilled with the new results from ATDS, and we feel more confident than ever as we continue to mobilize our company's core mission: reduce the toxic particulate and CO 2 emitted from the 230 million cars we drive every day in this... Bill O http://www.google.com/url?q=http://en.wikipedia.org/wiki/Bill_O%27Reilly_(commentator)&source=dictionary&usg=AFQjCNFxFknzcjgY7uMC2zHM007cdagdwg Earthtimes (press release) http://www.google.com/url?q=http://www.earthtimes.org/articles/show/new-aftermarket-automotive-technology-is,650849.shtml&source=dictionary&usg=AFQjCNHSaFW34CTOxsGNShcI1t_--oaAOQ Dec 10, 2008 72476 96968 parting While this moment is bittersweet, we're parting on good terms and we know that each of us has benefited greatly from the other," team president JD Gibbs said in a statement.