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E-M:/ Air pollution alert

Enviro-Mich message from "Alex J. Sagady & Associates" <ajs@sagady.com>

For the last couple of days we've had a slow moving
high pressure center that is more typical of traditional
summer weather....the kind of condition we generally did not have this past
summer in a most untypical Michigan summer for both
elevated temperatures and air pollution.

Yesterday we had ambient ozone over the concentration level
of the ambient ozone standard {unhealthy for sensitive groups} at:

Flint   87
Otisville  87   (genessee county)
Harbor Beach  89  (huron county)

A number of other locations were in the lower 80s

The last couple of days have also seen air pollution
in the "unhealthy for sensitive groups" range for
2.5 micron or less particulate matter (PM-2.5).   It appears
that these fine particulates are capable in Michigan of typically causing
several more days of unhealthy air pollution than from exposure to
ozone and photochemical oxidants.    While Michigan
is proposing only Wayne and Monroe counties as formal
non-attainment areas, PM 2.5 air pollution reflecting
"unhealthy for sensitive groups" (USG) concentrations can occur
in many areas of Michigan.

Today USG PM 2.5 (beginning at 40.5 micrograms per cubic
meter on the 24 hour average) is occurring at this hour at:

Dearborn  44
Port Huron 45.2
Ypsilanti  41.7

However, Lansing, Grand Rapids, Flint, Allen Park, Kalamazoo
Saginaw and Houghton Lake are all in the 35-40 ug/M3 range
at this hour.

Although MDEQ has other PM 2.5 monitors in several other locations,
these monitors do not report their results online in a continuous basis.

What is becoming clear is that solving PM 2.5 problems
in Michigan is going to be a tough environmental management
and control problem.   There are both local and long range
transport sources.   PM 2.5 long range transport to Michigan
occurs on days when Michigan would otherwise not ordinarily
see a problem.

PM 2.5 can be directly emitted from local industrial sources as
solid particles.   Mobile sources, notably diesel truck traffic, will
make a substantial contribution.   PM 2.5 can form in the atmosphere
as solid particles or aerosals from the reaction of gases that
are precursors, such as ozone, sulfur dioxide, nitrogen oxides.    Ammonia
emissions from concentrated animal feeding operation will make
a contribution to PM through atmospheric reactions with sulfates and
nitrates to form particles.

Ambient health standards for PM 2.5 may get more stringent as EPA is
presently reviewing the health science showing adverse health effects at
lower ambient concentrations of this pollutant.   Some researchers consider
that PM 2.5 exposure does not show a lower bound below which health
effects in terms of excess deaths do not occur.   PM 2.5 is implicated in
exacerbation of asthma, other lung diseases and cardiovascular disease, and
there are clear associations between PM 2.5 exposure and excess deaths.

You can see the current air quality index at:

Ozone concentrations show at:

PM 2.5 and PM 10 concentrations statewide show at:

Alex J. Sagady & Associates        http://www.sagady.com

Environmental Enforcement, Permit/Technical Review, Public Policy,
Evidence Review and Litigation Investigation on Air, Water and
Waste/Community Environmental and Resource Protection
Prospectus at:  http://www.sagady.com/sagady.pdf

PO Box 39,  East Lansing, MI  48826-0039
(517) 332-6971; (517) 332-8987 (fax); ajs@sagady.com

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