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RE: E-M:/ RE: / More on PM 2.5 air pollution in Michigan
thanks, alex, that helps . . .
if i could push just a little bit further . . . the
material from naqo explains why cities in michigan are experiencing higher
levels than the rest of the country (high pressure to the northeast, persistent
stagnant conditions, a system approaching from the south transporting pollutants
into the region) . . .
but is this combination of factors all that unusual . .
put another way, are the levels of pm 2.5 pollution
being experienced by michigan cities unusually high for those cities, or just
relatively higher than the rest of the country currently . . .
if these are very unusually high levels for these
cities, and if the combination of weather factors is not all that unusual, i'm
still wondering what has changed to produce these unusual events . . .
craig k harris
department of sociology
michigan agricultural experiment
national food safety and toxicology
institute for food and agricultural
biological station longterm ecological research project
michigan state university
02:18 PM 02/05/2005, you wrote:
message from "harrisc"
share the question that was expressed yesterday . . . can someone on
list suggest some explanations why these high levels of pm 2.5
would be occuring on warm sunny winter days . . .
This is from US EPA 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
Alex J. Sagady & Associates
Permit/Technical Review, Public Policy,
Evidence Review and Litigation
Investigation on Air, Water and
Waste/Community Environmental and Resource
Prospectus at: http://www.sagady.com/sagady.pdf
PO Box 39,
East Lansing, MI 48826-0039
(517) 332-6971; (517) 332-8987