The Blair Street air monitoring station measures air quality in the north central area of St. Louis. This site is part of multiple air monitoring networks:
- National Core (NCore) network - measures multiple air quality and meteorological parameters to provide data to determine compliance with National Ambient Air Quality Standards (NAAQS). It also provides data for health effects and other scientific studies, evaluating mathematical air quality models, public information and other purposes.
- National Chemical Speciation Network (CSN) - measures the different organic and inorganic chemical species that contribute to airborne fine particulate matter (PM2.5).
- National Air Toxics Trends Stations (NATTS) network - intended to measure long-term trends in hazardous air pollutants or air toxics and provide air toxics data for various scientific studies. NATTS measurements include collecting samples that are analyzed for volatile and semi-volatile organic compounds, carbonyls and metallic elements. NATTS also includes measuring and reporting hourly average airborne black carbon.
The Blair Street station is also a Photochemical Assessment Monitoring Station (PAMS) site. PAMS sites monitor ozone precursors and meteorological measurements in order to strengthen ozone model development and track trends in what could be forming ground level ozone.
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
Carbon Monoxide
Since 1971, EPA has maintained two standards for carbon monoxide: 35 parts per million (ppm) averaged over one hour and 9 ppm averaged over eight hours - not to be exceeded more than once per year. If design values are at or below the standard, then an area is in compliance. Design values correspond to an annual average of eight-hour concentrations and one-hour concentrations.
*All times listed in reports reflect Central Standard Time (CST).
- Additional information about Carbon Monoxide State Planning efforts
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- Carbon monoxide data in third column of first page. Each day has three pages of data.
- Data from past 10 days through current date.
Nitrogen Dioxide
In 2010, EPA revised the one-hour NO2 standard. The primary National Ambient Air Quality Standard (NAAQS), based on health effects, for NO2 is 100 parts per billion (ppb) averaged over one hour. The one-hour standard is based on a three-year design value, which is calculated by taking the 98th percentile of the one-hour daily maximum concentrations recorded each year, and averaging three years together. The annual standard of 0.053 parts per million (ppm) – or 53 ppb – is based on the annual arithmetic mean and is not to be exceeded. An area is in compliance if the design value is at or below the standard.
*All times listed in reports reflect Central Standard Time (CST).
- One-hour NO2 design values
- Eight highest one-hour NO2 values, year-to-date
- Map of Missouri's NO2 monitoring sites
- Additional information about Nitrogen Dioxide State Planning efforts
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- Data in first column on second page. Each day has three pages of data.
- Data from past 10 days through current date
Ozone Pollutant
The primary National Ambient Air Quality Standard (NAAQS) for ozone is 0.070 parts per million (ppm) averaged over eight hours (annual fourth-highest daily maximum 8-hour concentration, averaged over three years). The federal ozone monitoring season runs from March 1 to Oct. 31.
*All times listed in reports reflect Central Standard Time (CST).
- 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
- Daily maximum average eight-hour concentration for each site from beginning of season
- Map of Missouri's ozone monitoring sites
Additional information about Ozone State Planning efforts
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- Ozone data in fourth and fifth columns
- "P" stands for primary monitor
- "S" stands for secondary monitor
- Data from 10 days ago through current date
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 sixth column of second page. Each day has three pages of data.
- 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 on second page, sixth column. Each day has three pages of data.
- Data for past 10 days through current date
Sulfur Dioxide
In 2010, EPA not only established a new one-hour standard, but also introduced a new form for determining compliance. The primary National Ambient Air Quality Standard (NAAQS), based on health effects, for SO2 is 75 parts per billion (ppb) averaged over one hour. The new form requires three years of data — the average SO2 concentration from each hour of the year. The department and EPA calculate the design value, using the 99th percentile of one-hour daily maximum concentrations, averaged over three years.
*All times listed in reports reflect Central Standard Time (CST).
- One-hour SO2 design values
- Four highest one-hour SO2 values year-to-date
- Map of Missouri's SO2 monitoring sites
Additional information about Sulfur Dioxide State Planning efforts
Technical issues can affect ability to deliver quality data. Access a table of symbols with explanation of the problems they represent.
- SO2 data in sixth column. Each day has three pages of data.
- Data from past 10 days through current date
3247 Blair St.
St. Louis, MO 63107
United States
Air Pollution Control Program
Division of Environmental Quality
P.O. Box 176
Jefferson City, MO 65102-0176
United States