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Re: E-M:/ RE: / More on PM 2.5 air pollution in Michigan



At 02:18 PM 02/05/2005, you wrote:

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Enviro-Mich message from "harrisc" <Craig.Harris@ssc.msu.edu>
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i share the question that was expressed yesterday . . . can someone on the
list suggest some explanations why these high levels of pm 2.5 pollution
would be occuring on warm sunny winter days . . .
cheers,

This is from US EPA national forecasters    http://www.epa.gov/airnow

National Air Quality Outlook

Saturday, February 5: A broad area of high pressure centered over the Northeast will lead to reduced mixing, light winds, and Moderate AQI levels over much of the eastern and central U.S. In the Midwest, high particle levels from this past week will continue as stagnant conditions persist across the region, resulting in Unhealthy for Sensitive Groups AQI levels. In the Upper-Midwest and Plains, an approaching low pressure system will drive strong southerly winds which will transport pollutants into the region, leading to Moderate AQI levels. In the West, high pressure over the Great Basin will reduce mixing across the region, leading to Moderate AQI levels in a few valley locations of the Inter-Mountain West. In the Central Valley of California, strong temperature inversions and fog will result in Moderate to Unhealthy for Sensitive Groups AQI levels.

Sunday, February 6: High pressure over the Northeast will again lead to light winds and Moderate AQI levels for much of the Northeast, Mid-Atlantic, and Midwest. Areas of the Midwest will continue to see Unhealthy for Sensitive Groups AQI levels. In the Upper-Midwest and Northern Plains, northerly winds behind a cold front will usher in a clean air mass, resulting in Good AQI levels. In the Southern Plains, a low pressure system will increase vertical mixing, leading to rain and Good AQI levels. In the West, an upper-level low pressure system moving into the Pacific coast will result in increased onshore flow, and Good AQI levels in coastal regions of California and throughout the Pacific Northwest. Inland valleys will continue to see stagnant conditions, fog, and Moderate AQI levels.

Monday, February 7: High pressure will persist in the Northeast, leading to light winds and Moderate AQI levels in the Northeast, Mid-Atlantic, and portions of the Southeast. A low pressure system moving through the Midwest will increase vertical mixing, leading to rain showers and improving air quality. However, southerly winds over much of the region will lead to increased moisture and transport of particles, resulting in Moderate AQI levels. In the West, an upper-level low pressure system will keep the atmosphere well-mixed, leading to generally Good AQI levels. A few valley locations, especially the Central Valley of California, will see Moderate AQI levels due to strong temperature inversions and fog.





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