December
2007
Air Quality Summary
Air quality during
December
was in the "Good" category
for 17 days,
in the "Moderate" category
for 13 days, and
in the "Unhealthy for Sensitive Groups" category for 1 days.
Precipitation was 3.46 inches
above normal levels in the Puget
Sound region, with SeaTac airport receiving 9.08 inches
of rainfall. The airport average monthly temperature of 39.8° F
was 0.9 degrees
below normal for
December
with a maximum temperature of 59° F
on the 3rd.
A minimum temperature of 28° F
occurred on the 8th and the 9th.
-
The highest PM2.5 value of
48 µg/m3 was in the
"Unhealthy for Sensitive Groups" category (AQI of 115)
and was measured on Sunday the 9th at the Marysville site.
-
The highest PM10 value of
36 µg/m3 was in the
"Good" category (AQI of 33)
and was measured on Tuesday the 11th and Friday the 21st at the Duwamish site in Seattle.
-
The highest 8-hour average for carbon monoxide was 2.3
ppm, in the "Good" category (AQI of 26),
and occurred during the early evening hours of
Saturday the 8th at the 148th Ave NE site in Bellevue.
-
Air quality in the month of
December exceeded our PM2.5 health goal in King County 2 times, Snohomish County 2 times, Pierce County 1 time, and Kitsap County 0 times.
