September
2006
Air Quality Summary
Air quality during
September
was in the "Good" category
for 22 days, and
in the "Moderate" category
for 8 days.
Precipitation was 0.2 inches
below normal levels in the Puget
Sound region, with SeaTac airport receiving 1.43 inches
of rainfall. The airport average monthly temperature of 62.3° F
was 1.2 degrees
above normal for
September
with a maximum temperature of 89° F
on the 2nd.
A minimum temperature of 47° F
occurred on the 21st, 22nd and 23rd.
-
The highest PM2.5 value of
25 µg/m3 was in the
"Moderate" category (AQI of 69)
and was measured on Sunday the 3rd at the Duwamish site in Seattle.
-
The highest PM10 value of
47 µg/m3 was in the
"Good" category (AQI of 44)
and was measured on Wednesday the 27th at the Duwamish site in Seattle.
-
Ozone 8 hour standard - The highest 8-hour average for ozone was 0.077 ppm,
in the "Moderate" category (AQI of 82),
and occurred on Sunday, September 3rd at the Mud Mountain Rd site in Enumclaw.
-
The highest 8-hour average for carbon monoxide was 1.6
ppm, in the "Good" category (AQI of 18),
and occurred during the late evening hours of
Saturday the 22nd at the 148th Ave NE site in Bellevue.
-
Air quality in the month of
September
exceeded our PM2.5 health goal in Snohomish County times,
in King County times,
in Pierce County times
and in Kitsap County times.
