The Branch Street air monitoring station is located in an industrial area of St. Louis. Metal recycling facilities surround a large portion of the site, with an active railroad to the east and Interstate 70 to the west. All of these are potential sources of air pollution. This station helps determine public exposure to air pollutants from these sources.
However, due to its particular industrial location, EPA considers the Branch Street station a unique middle-scale site. Monitoring agencies cannot compare its data to the annual standard for PM2.5.
To learn about other air monitoring sites the department operates as part of the state's ambient air monitoring network, visit Air Monitoring Sites.
Pollutants
Fine Particulate Matter (PM 2.5)
The primary National Ambient Air Quality Standards (NAAQS), based on health effects, for fine particulate matter smaller than 2.5 micrometers in diameter, PM2.5, is 35 micrograms per cubic meter of air (μg/m3) averaged over 24 hours (98th percentile, averaged over three years) and 12 μg/m3 annual average (averaged over three years).
*All times listed in reports reflect Central Standard Time (CST).
- Annual PM2.5 design values
- 24-Hour PM2.5 design values
- Map of Missouri's PM2.5 monitoring sites
- Additional information about Particulate Matter State Planning efforts
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 the last column on the right
- Data from past 10 days through current date
Particulate Matter (PM 10)
The primary National Ambient Air Quality Standard (NAAQS), based on health effects, for particulate matter smaller than 10 micrometers, PM10, is 150 micrograms per cubic meter of air (μg/m3) averaged over 24 hours — not to be exceeded more than once per year on average over three years.
*All times listed in reports reflect Central Standard Time (CST).
- Information about standard and monitoring
- Expected number of exceedance days in a year
- Map of Missouri's PM10 monitoring sites
- Additional information about Particulate Matter State Planning efforts
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- PM10 data in the fourth column from the left
- Data for past 10 days through current date
100 Branch St.
St. Louis, MO 63102
United States
Air Pollution Control Program
Division of Environmental Quality
P.O. Box 176
Jefferson City, MO 65102-0176
United States