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Pinedale Online > News > February 2011 > One orange dot in the US = us!

Boulder hits 98 PPB. Photo by DEQ Boulder Air Quality Monitoring Station.
Boulder hits 98 PPB
Boulder one-hour ozone reading hit 98 PPB around 3:30PM on Monday, Feb. 21st. Reading levels steadily dropped after that time as increasing clouds rolled in and covered the sky, going below 75 PPB by 5:30PM.

Feb 21 Boulder ozone. Photo by DEQ Boulder Air Quality Monitoring website.
Feb 21 Boulder ozone
1 hour and 8 hour average ozone for Boulder, Wyoming on Monday, Feb. 21st, as of 4:30PM. Info charted from the Wyoming DEQ website dataset.

Scroll down for more data about the one-hour ground-level ozone readings for Monday, Feb. 21, 2011.

One orange dot in the US = us!
Boulder ozone level hits 98 PPB on Monday, Feb. 21st
by Pinedale Online!
February 21, 2011

The U.S. government AirNow air quality monitoring website showed just one orange dot for the entire United States for the 5:00PM hourly ozone reading. An orange dot means "Unhealthy for Sensitive Groups". That one dot was Boulder, Wyoming. The 1-hour reading at 3:45PM was 98 PPB on the Boulder monitoring station. The reading lowered to 89 PPB for the 1-hour and 59 PPB for the 8-hour at 5:00PM according to the DEQ monitor. The 8-hour ozone level reached 77 PPB at 9:30 PM. The EPA standard for 8-hour ozone is 75 PPB. EPA does not have a one-hour standard.

Local health officials recommend anyone with breathing, eye or nose sensitivities stay inside and avoid breathing the outside air or exerting themselves while air pollution levels are higher than optimum.

Click on this link to go to the AirNow website:

Click on this website to go to the Wyoming DEQ air quality monitoring website:

Related Links
  • Boulder 1-hour ozone at 98 PPB at 3:45PM (PDF) - February 21, 2011
  • Boulder 8-hour ozone at 77 PPB at 9:35PM (PDF) - February 21, 2011
  • DEQ Boulder Monitoring Station - Boulder, Wyoming
  • Ozone readings rise in the Boulder area - February 15, 2011 - Pinedale Online!

  • AirNow Ozone Monitor. Photo by
    AirNow Ozone Monitor hourly ozone data for Monday, February 21, 2011 showing only one orange dot at 5:00 PM in the entire United States with an unhealthy air quality reading for sensitive groups.

    Orange level. Photo by
    Orange level

    Feb 1-21, 2011 Ozone at Boulder. Photo by Wyoming DEQ generated graph.
    Feb 1-21, 2011 Ozone at Boulder
    Graph showing 1-hour and 8-hour aveage ozone levels for February 1-21, 2011, as of 10:10PM on Feb. 21. Info based on WY DEQ monitoring data which has not been verified.
    Pinedale Online > News > February 2011 > One orange dot in the US = us!

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