Warm weather, good air quality continues, ADEQ says

No health impacts are expected from ozone and dust at the beginning of this week, but expect some rain in the state toward the end of the week, the Arizona Department of Environmental Quality is predicting.
ADEQ says ozone, carbon monoxide and PM-2.5 (particles) levels should be in the “good” range today. The air quality index levels are “good,” “moderate,” “unhealthy for sensitive groups,” “unhealthy” and “very unhealthy.”
“The synoptic pattern has an upper-level ridge over the western U.S. as well as a cut-off low west of Baja California. The cut-off low will likely play a part in creating some showers throughout the state later in the week; however, in the meantime, the ridge will help keep temperatures warm and skies mostly clear,” R. Nicoll said in a report on the Oct, 12 air quality forecast. “Temperatures should remain in the mid-to-upper 90s through most of the week. Looking at air quality, ozone will likely increase some due to the mostly clear skies and light winds throughout the atmosphere. PM-2.5 will likely stay in the Upper Good range due to light winds and weak morning inversions. Lastly, PM-10 should stay comfortably in the Middle Good range due to no strong winds in the forecast.”
The Maricopa County Dust Control Action Forecast is issued to assist in the planning of work activities to help reduce dust pollution. A recorded message of this forecast can be accessed at 602-771-2368. To review the complete air quality forecast for the Phoenix metropolitan area, as well as the health impacts and reduction methods for different air pollutants, call 602-771-2367 for recorded forecast information or click on ADEQ’s Air Quality Forecast at http://www.azdeq.gov/environ/air/ozone/ensemble.pdf.
Definitions
ADEQ defines O3 as ozone, a secondary pollutant that is formed by the reaction of other primary pollutants (precursors) such as VOCs (volatile organic compounds) and NOx (Nitrogen Oxides) in the presence of sunlight. VOCs are emitted from motor vehicles, chemical plants, refineries, factories and other industrial sources. NOx is emitted from motor vehicles, power plants, and other sources of combustion.
CO, or carbon monoxide, is a colorless, odorless, poisonous gas formed when carbon in fuels is not burned completely, ADEQ says. In cities, as much as 95 percent of all CO emissions emanate from automobile exhaust. Other sources include industrial processes, non-transportation fuel combustion, and natural sources such as wildfires. Peak concentrations occur in colder winter months.
PM-10 and PM-2.5 (particles): The term “particulate matter” (PM) includes both solid particles and liquid droplets found in air. Many man-made and natural sources emit PM directly or emit other pollutants that react in the atmosphere to form PM. Particles less than 10 micrometers in diameter tend to pose the greatest health concern because they can be inhaled into and accumulate in the respiratory system. Particles less than 2.5 micrometers in diameter are referred to as “fine” particles and are responsible for many visibility degradations such as the “Valley Brown Cloud” (see http://www.phoenixvis.net/). Particles with diameters between 2.5 and 10 micrometers are referred to as “coarse.” Sources of PM are all types of combustion (motor vehicles, power plants, wood burning, etc.) and some industrial processes.

 

The Oct. 12 forecast according to http://www.azdeq.gov/environ/air/ozone/ensemble.pdf

The Oct. 12 forecast according to http://www.azdeq.gov/environ/air/ozone/ensemble.pdf

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