snowfall blanketing sagebrush, the state issued
more ozone updates this week with a warning
to the public that Friday might bring higher
than healthy hourly levels.
The federal ozone or O3 standard is 70 parts
per billion based on 8-hour averages but the
Wyoming Department of Environmental Quality’s
Air Quality Division’s latest email notice
suggests that high hourly levels are possible
at the Upper Green River Basin’s monitoring
sites in Boulder, Big Piney, Pinedale, Daniel
South and Juel Spring.
People with respiratory problems or who
plan on being active outside should check
ozone levels first in those areas, it warns.
On March 5 and 6, AQD announced “ozone
action day” alerts for the public and energy industry
to decrease ground-level emissions of
volatile organic compounds and nitrogen. It
also has issued ozone outlooks or warnings
daily about short-term high levels since then.
During times with heavy snow cover, temperature
inversions and sunshine, pollutants
can create wintertime ozone. The winter ozone
season runs from January through March.
Current information on ozone levels at
monitoring stations at Pinedale, Daniel South,
Boulder, Big Piney and Juel Spring can be
found at www.wyvisnet.com.
To see previous 1-hour levels at any site,
plot recent data for the appropriate periods.
More information on ozone and the health
effects are at http://www.health.wyo.gov.