National Park Service Arrowhead
Explore Air

Current Ozone and Weather Data in National Parks


Yellowstone National Park - Water Tower, WY
EPA AQS Site Number: 56-039-1011


Today's Data   Data Timelines   Ozone Health Advisory  
Ozone Wednesday February 21, 2018 
Hour Ending
(Local Time)
1-Hour Average
(parts per billion)
8-Hour Average
(parts per billion)
12 AM 41 41
1 AM -- 41
2 AM 43 41
3 AM 42 40
4 AM 42 40
5 AM 42 40
6 AM 42 40
7 AM 41 40
8 AM 40 40
9 AM 38 41
10 AM 39 42
11 AM 41 42
12 PM 41 43
1 PM 42 43
2 PM -- 43
3 PM 44 43
4 PM 44 43
5 PM 44 43
6 PM 44 43
7 PM 43 43
8 PM 43 43
9 PM 42 43
10 PM 43 43
11 PM 43 43
Weather and Ozone Data Wednesday February 21, 2018
Hour
Ending
(Local Time)
Ozone
(parts per
billion)
Wind
Speed
(meters per
second)
Wind
Direction
Temperature
(degrees C)
Relative
Humidity
(%)
Solar
Radiation
(watts per
meter
squared)
Rainfall
(millimeters)
12 AM 41 1.0 N -25.7 78 -- 0.0
1 AM -- 1.0 N -25.8 78 -- 0.0
2 AM 43 0.7 NW -24.5 79 -- 0.0
3 AM 42 0.7 N -23.1 79 -- 0.0
4 AM 42 0.7 NW -23.8 79 -- 0.0
5 AM 42 0.8 NW -24.6 78 -- 0.0
6 AM 42 0.5 W -24.1 79 -- 0.0
7 AM 41 0.5 W -23.2 79 -- 0.0
8 AM 40 0.5 SE -23.2 79 -- 0.0
9 AM 38 0.4 S -22.5 79 2 0.0
10 AM 39 1.2 SW -19.9 78 11 0.0
11 AM 41 1.7 S -18.0 75 16 0.0
12 PM 41 2.3 S -15.0 68 47 0.0
1 PM 42 3.0 S -13.2 66 35 --
2 PM -- -- -- -- -- -- --
3 PM 44 3.6 SW -12.3 60 26 0.0
4 PM 44 3.6 SW -12.4 59 18 0.0
5 PM 44 3.2 SW -12.9 62 15 0.0
6 PM 44 2.5 SW -14.2 68 -- 0.0
7 PM 43 1.0 SW -16.1 77 -- 0.0
8 PM 43 0.8 W -17.7 82 -- 0.0
9 PM 42 0.8 NW -18.8 82 -- 0.0
10 PM 43 0.7 NW -20.0 82 -- 0.0
11 PM 43 0.9 NW -20.6 82 -- 0.0
U.S. Department of the Interior Accessibility Freedom of Information Act USA.gov Search
Privacy Policy Disclaimer NPS Home Contact Us
updated on 02/22/2018 2:42 PM  I   http://www.nature.nps.gov/air/data/current/data_YELL-WT2.cfm   I  Email: Webmaster