The Arnold West air monitoring station is located generally upwind of, but near St. Louis. It helps to characterize air quality upwind of St. Louis and to determine exposure to air pollutants of a portion of the population of the St. Louis Metropolitan Statistical Area and monitor attainment of the ambient air quality standards.
Pollutants
Ozone Pollutant
The primary National Ambient Air Quality Standard for ozone is 0.070 parts per million averaged over eight hours (annual fourth-highest daily maximum 8-hour concentration, averaged over three years). The federal ozone season for monitoring runs from March 1 to Oct. 31.
Departmental information about ozone (O3)
- Description
- Health effects
- Tips to reduce ozone
- 2008 and 2015 standards plus related documents
- Eight-hour ozone design values
- Four highest eight-hour ozone values from beginning of ozone season
- Running list of sites with exceedances from beginning of season
- Monthly number of exceedances, 2022 and 2023
- Daily maximum average eight-hour concentration for each site from beginning of season
- Map of Missouri's ozone monitoring sites
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- Ozone data in third and fourth columns on each day's first page
- "P" stands for primary monitor. "S" stands for secondary monitor
- Data from 10 days ago through current date
- Central Standard Time
Fine Particulate Matter (PM 2.5)
Departmental information about particulate matter (PM)
- Description of two groups of particulate matter: PM2.5 and PM10
- 1997, 2006 and 2012 standards for PM2.5 plus related documents
- 2006 PM10 standard and pertinent documents
- Annual PM2.5 design values
- 24-Hour PM2.5 design values
- Map of PM2.5 sites
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- PM2.5 data in eighth column on each day's first page
- Data from 10 days ago through current date
- Central Standard Time
Particulate Matter (PM 10)
Departmental information about particulate matter (PM)
- Description of two groups of particulate matter: PM2.5 and PM10
- 1997, 2006 and 2012 standards for PM2.5 plus related documents
- 2006 PM10 standard and pertinent documents
- Information about standard and monitoring
- Expected number of exceedance days in a year
- Map of PM10 monitoring stations
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- PM10 data in first column on each day's second page
- Data from 10 days ago through current date
- Central Standard Time
1709 Lonedell Drive
Arnold West, MO 63010
United States
Air Pollution Control Program
Division of Environmental Quality
P.O. Box 176
Jefferson City, MO 65102-0176
United States