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Air Quality

Air Quality Alert - High Winds
September 27, 2009
(PM10 Concentration and Meteorological Observations)
Click here for a graphical representation

Date and Time Issued: September 27, 2009   3:47 AM MDT 
Date Issued for: September 27, 2009
Date and Time Cancelled: September 27, 2009 6:00 PM MDT
PM Concentrations location: Credit Union
Weather Observations:  

Time

PM10
Concentration

Wind Speed

Direction

Peak Wind

Precipitation

(military)

(Credit Union -ug/m3)

(mph)

 

(mph >30)

(inches)

01:00

15.6 9.2 NW   NA

02:00

15.5 12.7 NNW   NA

03:00

10.8 8.1 NNW   NA

04:00

15.0 13.8 N   NA

05:00

68.4 13.8 N   NA

06:00

54.9 11.5 N   NA

07:00

63.2 11.5 NNW   NA

08:00

70.3 32.2 NNW 40.3 NA

09:00

512.1 35.7 NNW 41.4 NA

10:00

71.8 26.5 NNW 38.0 NA

11:00

45.0 38.0 NNW 43.7 NA

12:00

79.1 39.1 NNW 47.2 NA

13:00

62.4 35.7 NW 48.3 NA

14:00

100.3 38.0 NNW 49.5 NA

15:00

73.3 33.4 NW 48.3 NA

16:00

145.0 26.5 NNW 39.1 NA

17:00

-0.5 24.2 NNW 35.7 NA

18:00

-0.6 19.6 NNW 25.3 NA

19:00

1.7 13.8 NNW   NA

20:00

2.7 11.5 NW   NA

21:00

0.7 13.8 NNW   NA

22:00

1.4 13.8 NNW   NA

23:00

8.2 17.3 NW   NA

24:00

4.2 9.2 NNW   NA

Averages

46.8 21.2      

PM10 24 hour Concentration = 46.8 ug/m3 Credit Union (West Rapid City)

PM10 24 hour Standard = 150 ug/m3

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