September
2007
Air Quality Summary
Air quality during
September
was in the "Good" category
for 25 days, and
in the "Moderate" category
for 5 days.
Precipitation was 1.53 inches
above normal levels in the Puget
Sound region, with SeaTac airport receiving 3.16 inches
of rainfall. The airport average monthly temperature of 59.9° F
was 1.2 degrees
below normal for
September
with a maximum temperature of 85° F
on the 10th.
A minimum temperature of 46° F
occurred on the 24th and 29th.
-
The highest PM2.5 value of
22 µg/m3 was in the
"Moderate" category (AQI of 64)
and was measured on Tuesday the 11th at the Duwamish site in Seattle.
-
The highest PM10 value of
49 µg/m3 was in the
"Good" category (AQI of 45)
and was measured on Tuesday the 11th at the Duwamish site in Seattle.
-
The highest 8-hour average for carbon monoxide was 1.8
ppm, in the "Good" category (AQI of 20),
and occurred during the early evening hours of
Tuesday the 25th at the 148th Ave NE site in Bellevue.
-
Ozone 8 hour standard - The highest 8-hour average for ozone was 0.064 ppm,
in the "Good" category (AQI of 50),
and occurred on Tuesday, September 11th at the Mud Mountain site in Enumclaw.
-
Air quality in the month of
September did not exceed our PM2.5 health goal in any of the 4 counties.
