SOUTH DAKOTA Department of
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Air Quality

 

Air Quality Alert - High Winds
September 21, 2012
(PM10 Concentration and Meteorological Observations)
Click here for a graphical representation

Date and Time Issued: September 21, 2012   2:24 AM MDT 
Date Issued for: September 21, 2012   10:00 AM MDT
Date and Time Cancelled: September 21, 2012   7:00 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

14.0 10.4 N   NA

02:00

25.2 9.2 NNW   NA

03:00

11.9 4.6 WNW   NA

04:00

13.7 8.1 NW   NA

05:00

13.7 6.9 NW   NA

06:00

30.7 8.1 NW   NA

07:00

116.7 9.2 NW   NA

08:00

247.5 6.9 WNW   NA

09:00

115.1 5.8 NW   NA

10:00

169.0 20.7 NNW   NA

11:00

173.9 23.0 NNW 33.4 NA

12:00

83.7 25.3 N 38.0 NA

13:00

155.6 27.6 NW 40.3 NA

14:00

145.0 25.3 NNW 38.0 NA

15:00

121.5 29.9 NNW 39.1 NA

16:00

88.0 32.2 NNW 43.7 NA

17:00

80.5 27.6 N 36.8 NA

18:00

63.6 26.5 NNW 36.8 NA

19:00

61.8 24.2 N 31.1 NA

20:00

56.7 16.1 N   NA

21:00

69.4 12.7 N   NA

22:00

52.4 6.9 NNW   NA

23:00

75.2 4.6 NW   NA

24:00

28.9 9.2 NNW   NA

Averages

83.9 17.4      

PM10 24 hour Concentration = 83.9 ug/m3 Credit Union (West Rapid City)

PM10 24 hour Standard = 150 ug/m3

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