Pm10 levels

Why is particulate matter bad? What is PMpollutant? Using a nationwide network of monitoring sites, EPA has developed ambient air quality trends for particle pollution, also called Particulate Matter (PM). PM describes inhalable particles, with diameters that are generally micrometers and smaller. Under the Clean Air Act, EPA sets and reviews national air quality standards for PM.

National Trends in PM 2. When someone talks about PM they are referring to particles smaller than 10µm. These particles include dust, pollen and mold spores. Conversely, when someone references PM 2. These smaller particles include combustion particles, organic compounds and metals. PM is particulate matter micrometers or less in diameter, PM 2. By way of comparison, a human hair is about 1micrometres, so roughly fine particles could be placed on its width. Coarse dust particles (PM 10) are 2. Sources include crushing or grinding operations and dust stirred up by vehicles on roads.

Fine particles (PM ) are 2. The term fine particles, or particulate matter 2. Like inches, meters and miles, a micron is a unit of measurement for distance. There are about 20microns in an inch. AirNow can help you monitor air quality near you, and protect yourself and your family from elevated PM levels.

Environmental Effects Visibility impairment. Find out what they mean and why you should monitor their levels. PM) that have a diameter of less than 2. The Air Quality Index is based on measurement of particulate matter ( PM and PM ), Ozone (O 3), Nitrogen Dioxide (NO 2), Sulfur Dioxide (SO 2) and Carbon Monoxide (CO) emissions. Most of the stations on the map are monitoring both PM 2. PMrefers to particulate matter that is micrograms per cubic metre or less in diameter. PMis generally subdivided into a fine fraction of particles 2. The EPA has identified and characterized significant risks to public health from indoor environmental contaminants that are commonly found in homes, schools, offices, and other buildings where most Americans spend up to of their time.

These recommendations may help reduce exposure during short-term pollution episodes in which PM2. Who needs to take steps to reduce exposure when PM2. Limit value to be met as of 1. Reducing emissions of inhalable particles improves public health as well as visibility. PM ), ozone (O ), nitrogen dioxide (NO 2) and sulfur dioxide (SO 2). The scope of this review reflects the availability of new evidence on the health effects of these pollut-ants and their relative importance with regard to current and future health effects of air pollution in each of the WHO regions.

It also represents the most current recommendations for continuing training.