[ADEQ Forecasts] ADEQ Daily Air Quality Forecast for Thurs., Oct. 18

Wed Oct 17 13:27:54 MST 2007

For more information, or if you have problems viewing the image, please
visit our Web page:

http://www.azdeq.gov/environ/air/ozone/ensemble.pdf

VERY UNHEALTHY  (201-300)

UNHEALTHY (151-200)

UNHEALTHY FOR SENSITIVE GROUPS (101-150)

MODERATE (51-100)

GOOD (0-50)

For more information visit:

http://www.epa.gov/airnow/aqibroch

AIR QUALITY FORECAST FOR THURSDAY, OCTOBER 18, 2007

This report is updated by 1:00 p.m. Sunday thru Friday and is valid

for areas within and bordering Maricopa County in Arizona

FORECAST

DATE

NOTICES

(*SEE BELOW FOR DETAILS) 

AIR POLLUTANT

YESTERDAY

TUE 10/16/2007

NONE    

Highest AQI Reading/Site

(Preliminary data only)

TODAY

WED 10/17/2007

NONE 

TOMORROW

THU 10/18/2007

NONE 

EXTENDED

FRI 10/19/2007

NONE

O3*

38

MULTIPLE SITES

49

GOOD

43

GOOD

46

GOOD

CO*

18

WEST PHOENIX

15

GOOD

23

GOOD

22

GOOD

PM-10*

81

WEST 43RD

59

MODERATE

60

MODERATE

58

MODERATE

PM-2.5*

50

PHOENIX SUPERSITE

33

GOOD

36

GOOD

34

GOOD

* O3 = Ozone      CO = Carbon Monoxide      PM-10 = Particles 10 microns
& smaller      PM-2.5 = Particles smaller than 2.5 microns

*"Ozone Health Watch" means that the highest concentration of OZONE may
approach the federal health standard.

"PM-10 or PM-2.5 Health Watch" means that the highest concentration of
PM-10 or PM-2.5 may approach the federal health standard.

"High Pollution Advisory" means that the highest concentration of OZONE,
PM-10, or PM-2.5 may exceed the federal health standard.

"DUST" means that short periods of high PM-10 concentrations caused by
outflow from thunderstorms are possible.

Health message for Wednesday, Oct 17: Unusually sensitive people should
consider limiting prolonged exertion outdoors.

Health message for Thursday, Oct 18: Unusually sensitive people should
consider limiting prolonged exertion outdoors.

Synopsis and Discussion

A dusty morning region-wide as a deep trough of low pressure and
associated cold front has pushed through Arizona.  There may still be
some winds on the backside of this trough Wednesday that could help drag
some of this haze out.  High pressure will return late Wednesday through
Saturday.  This will increase the afternoon temperatures across the
region.  Phoenix can expect a high in the low 90s on Friday and
Saturday.  High pressure will also increase the mixing heights in the
forecast area.  This is important in that higher mixing heights will
allow accumulated pollution to mix out at higher elevations during the
afternoons.  For this reason, we expect Particulate levels to decrease
slightly each day through Saturday, remaining in the lower "Moderate"
range.  Yet another trough of low pressure is slated to impact the
forecast area late Saturday into Sunday.  It doesn't look like there is
any rain with this one, either.  So, we could be looking at more winds
and possible blowing dust by Sunday.  We'll keep any eye on that one.
Check back tomorrow for more.  Have a good day!  -J.Paul

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