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 Saturday September 23, 2017 
Hour Ending
(Local Time)
1-Hour Average
(parts per billion)
8-Hour Average
(parts per billion)
12 AM 31 31
1 AM 32 31
2 AM 35 31
3 AM 36 31
4 AM 35 32
5 AM 30 32
6 AM 27 33
7 AM 28 34
8 AM 30 35
9 AM 34 36
10 AM 35 36
11 AM 37 35
12 PM 38 35
1 PM 38 34
2 PM 38 33
3 PM 35 32
4 PM 34 31
5 PM 34 30
6 PM 32 30
7 PM 31 29
8 PM 30 28
9 PM 33 28
10 PM 31 27
11 PM 29 27
Weather and Ozone Data Saturday September 23, 2017
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 31 0.3 SE -0.3 94 -- 0.4
1 AM 32 0.5 W -0.4 94 -- 0.2
2 AM 35 0.5 E -0.6 92 -- 0.0
3 AM 36 0.9 NW -0.8 91 -- 0.0
4 AM 35 0.7 W -1.1 90 -- 0.0
5 AM 30 0.4 NE -1.2 93 -- 0.0
6 AM 27 0.3 NE -1.3 94 -- 0.0
7 AM 28 0.4 N -1.5 94 -- 0.0
8 AM 30 0.3 N -1.8 94 1 0.0
9 AM 34 0.5 N -0.9 88 42 0.0
10 AM 35 0.7 NE 0.8 78 107 0.0
11 AM 37 1.1 E 2.4 71 259 0.0
12 PM 38 1.4 E 3.4 66 661 0.0
1 PM 38 1.4 E 3.6 68 563 0.0
2 PM 38 1.3 N 4.5 62 713 0.0
3 PM 35 1.1 N 3.4 73 237 0.0
4 PM 34 0.9 N 3.1 76 178 0.0
5 PM 34 0.9 N 3.2 75 201 0.0
6 PM 32 0.8 N 3.7 75 223 0.0
7 PM 31 0.7 N 2.1 83 39 0.0
8 PM 30 0.6 NW 0.3 91 3 0.0
9 PM 33 1.0 N -0.2 91 -- 0.0
10 PM 31 1.7 N -0.7 91 -- 0.0
11 PM 29 1.5 NE -0.6 90 -- 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 09/24/2017 8:45 AM  I   http://www.nature.nps.gov/air/data/current/data_YELL-WT2.cfm   I  Email: Webmaster