forest park

Address: 5600 Clayton Ave
St. Louis, MO 63110
County: The city of St. Louis is not part of a county
Pollutants monitored:  Fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and black carbon (BC)
Pollutant monitored in the past: Particulate matter (PM10)
For information, make a Sunshine Law request.
Date established: Jan. 1, 2013
Site Coordinates
* Latitude: 38.63114°
* Longitude: -90.28115°
EPA Site ID: 29-510-0094

The Missouri Department of Natural Resources selected Forest Park for a near-road air monitor in St. Louis after analyzing traffic data and evaluating locations that met EPA's criteria. For example, monitors must be appropriate distances from trees, buildings and minor sources of pollutants. The potential major source of air pollution is Interstate 64, south of the site. Across I-64, lies Highlands Plaza, accessed by Oakland Avenue. To the north lies Forest Park, a large recreational green area that includes the St. Louis Zoo and other attractions.

The department established the Forest Park site in accordance with two federal rules that required near-road monitoring in the St. Louis area: the 2010 rule revising the NO2 standard and the 2011 rule continuing the CO standard. To read about the site selection, go to page 20 of the department's 2012 Monitoring Network Plan. St. Louis has a second near-road monitor: Rider Trail. Kansas City has one such site.

At the Forest Park site, the department monitors three criteria pollutants as well as black carbon (BC), a component of fine particulate matter.

Fine Particulate Matter (PM2.5) Data*

PM2.5 describes particles smaller than 2.5 microns in size. Industrial and residential combustion as well as vehicle exhaust emit fine particles into the air. Fine particles also form in the atmosphere when chemical reactions transform gases, such as sulfur dioxide, nitrogen oxides and volatile organic compounds, into microscopic solid or liquid particles. Fine particles can affect the health of everyone, especially children, elderly and people who suffer from asthma and other pulmonary conditions.

EPA uses two ways to determine compliance with PM2.5 federal standards. One looks at data over a 24-hour period, and the other takes into account data from a whole year. In December 2012, EPA tightened the annual PM2.5 standard, setting it at 12 micrograms per cubic meter, based on the three-year average of annual means. EPA
retained the 24-hour PM2.5 standard of 35 micrograms per cubic meter, based
on the 98th percentile of 24-hour measurements, averaged over three years.

Weekly summary of preliminary data from all PM2.5 sites
Annual PM2.5 design values
• 24-Hour PM2.5 design values

One-hour preliminary averages of readings at Forest Park
• PM2.5 data on second page, seventh column
• Data from past 10 days through current date

Preliminary up-to-date one-hour averages from all PM2.5 sites
• Data from past three days through current date
• Central Standard Time

Graph of PM2.5 annual design values from St. Louis sites, beginning in 2003

Graph of PM2.5 24-hour design values from St. Louis sites, beginning in 2003

Department's webpage about fine particulate matter
• Description of two groups of particulate matter: PM2.5 and PM10
• 1997, 2006 and 2012 standards for PM2.5 plus related documents

*Technical issues can affect ability to deliver quality data.
Click to access a table of symbols indicating issues.

Nitrogen Dioxide (NO2) Data*

Nitrogen dioxide is a gas produced from the burning of fossil fuels, such as gasoline and coal. At high concentrations, it can increase likelihood of respiratory problems. In addition, NO2 and other nitrous oxides are precursors to ground-level ozone.

In 2010, EPA established a new one-hour NO2 standard of 100 parts per billion.
An area is in compliance if the design value is at or below the standard.
The form to determine design value requires three years of data — the average NO2 concentrations
from each hour. The department and EPA calculate the design value, using the 98th percentile
of one-hour daily maximum concentrations, averaged over three years.

Weekly summary of preliminary data from all NO2 monitoring sites

One-hour preliminary averages from Forest Park
• NO2 data on first page, third column
• Data on all nitrous oxides (NOx) on first page, fourth column
• Data from past 10 days through current date

Preliminary data from all NO2 sites
• Data from past three days through current date
• Central Standard Time

Graph of NO2 Design Values, beginning in 2003

Department's webpage about NO2
• 2010 standard and related documents

*Technical issues can affect ability to deliver quality data.
Click to access a table of symbols indicating issues.

Carbon Monoxide (CO) Data*

Carbon monoxide is a gas with no color, odor or taste. It is toxic at high concentrations.

Since 1971, EPA has maintained two standards for carbon monoxide. The eight-hour
standard stands at 9 parts per million, and the one-hour standard stands at 35 parts per million.
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.

Summary of preliminary data from CO sites

One-hour preliminary averages from Forest Park
• CO data on first page, fifth column
• Data from past 10 days through current date

Preliminary up-to-date one-hour averages from all CO sites
• Data from three days ago through current date
• Central Standard Time

Graph of CO one-hour design values for all sites, beginning in 2003

Department's webpage about CO
• 1971 standard and related documents

*Technical issues can affect ability to deliver quality data.
Click to access a table of symbols indicating issues.

Related Links

Missouri's mapped network of air monitoring sites

Department's webpage about air quality
• Air quality forecasts for St. Louis, Kansas City and Springfield
• Tips to reduce air pollution, breathe better

Real-time views from department's cameras in Kansas City and St. Louis

EPA's standard for pollutants

AirNow.gov
• Air quality forecasts across the country
• Links to EPA resources about air quality

EPA's Air Sensor Toolbox for Citizen Scientists