SOUTH DAKOTA Department of
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Air Quality

 

Air Quality Alert - High Winds
July 20, 2011
(PM10 Concentration and Meteorological Observations)
Click here for a graphical representation

Date and Time Issued: July 20 , 2011   2:20 AM MDT 
Date Issued for: July 20, 2011   2:20 AM MDT
Date and Time Cancelled: July 20, 2011   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

23.1 3.5 SSW   NA

02:00

19.8 16.1 S   NA

03:00

32.7 12.7 S   NA

04:00

53.9 11.5 S   NA

05:00

45.4 11.5 W   NA

06:00

146.4 8.1 WNW   NA

07:00

239.7 6.9 WNW   NA

08:00

252.5 10.4 N   NA

09:00

155.7 25.3 NNW 43.7 NA

10:00

161.7 24.2 NNW 32.2 NA

11:00

204.7 21.9 NNW 33.4 NA

12:00

176.7 24.2 N 36.8 NA

13:00

110.1 25.3 N 34.5 NA

14:00

153.8 21.9 NNW   NA

15:00

104.0 15.0 N   NA

16:00

57.9 13.8 N   NA

17:00

41.2 13.8 N   NA

18:00

27.5 11.5 NNE   NA

19:00

49.3 8.1 N   NA

20:00

80.0 8.1 N   NA

21:00

60.3 5.8 N   NA

22:00

22.5 6.9 NNE   NA

23:00

25.1 8.1 ENE   NA

24:00

20.9 calm calm   NA

Averages

94.4        

PM10 24 hour Concentration = 94.4 ug/m3 Credit Union (West Rapid City)

PM10 24 hour Standard = 150 ug/m3

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