April
2007
Air Quality Summary
Air quality during
April
was in the "Good" category
for 27 days, and
in the "Moderate" category
for 3 days.
Precipitation was 1.9 inches
below normal levels in the Puget
Sound region, with SeaTac airport receiving .69 inches
of rainfall. The airport average monthly temperature of 50.6° F
was 0.4 degrees
above normal for
April
with a maximum temperature of 78° F
on the 6th.
A minimum temperature of 34° F
occurred on the 1st and on the 3rd.
-
The highest PM2.5 value of 22 µg/m3 was in the
"Moderate" category (AQI of 64)
and was measured on Thursday the 25th at the Duwamish site in Seattle.
-
The highest PM10 value of 43 µg/m3 was in the
"Good" category (AQI of 40)
and was measured on Friday the 6th at the Duwamish site in Seattle.
-
The highest 8-hour average for carbon monoxide was 1.6 ppm, in the "Good" category (AQI of 18),
and occurred during the early morning hours of Friday the 6th at the 148th Ave NE site in Bellevue.
- Air quality in the month of April did not exceed our PM2.5 health goal in Snohomish, King, Pierce, or Kitsap counties.
