This is raw data. It has not been validated and may contain errors.

  1. The data is obtained from automated, continuous instruments; no human has reviewed or checked the accuracy of this data.
  2. The data has been subject to only preliminary automated quality assurance procedures.
  3. Special conditions such as power outages and equipment malfunction can produce data that is invalid.
  4. This data is made available for the purpose of public awareness and should not be used in any medical or other scientific study.
  5. Quality assured data can be obtained by contacting the Missouri Department of Natural Resources Air Pollution Control Program. 

Current Air Pollution Data Report  PDF

Users Guide

This report is updated every day on a hourly basis.  All data is recorded using Central Standard Time, regardless of local time changes to daylight-saving time.

The following applies to each section of the report:

  1. The date of the data report and an abbreviated version of the site name appears in the center of the page, at the top of each section. To obtain a more complete name or exact location for a site, view the Criteria Pollutant Monitoring Sites Map. The map page links to lists of full site names, which in turn link to detailed information for each site.
  2. Next, each parameter measured at the site is listed horizontally at the top of the report. Chemical symbols are used when possible.  Following this paragraph is a listing of the most common chemical symbols used.   In the case of wind data, "D" indicates the direction the wind is coming from and "S" indicates the wind speed. Particulate matter is designated as "PM-10" for particulates 10 microns or less in diameter. "TEMP" indicates temperature.
  3. Common Chemical Symbols: NO-Nitrogen Oxide, NO2- Nitrogen Dioxide, NOX-Total Nitrogen Oxides, NH3- Ammonia gas, NT- Total Nitrogen compounds, H2S- Hydrogen sulfide, SO2- Sulfur dioxide(1 PPM limit), SO2S- Secondary SO2(5 PPM limit), O3- Ozone, O3S-Back up Ozone measurement, CO- Carbon monoxide.
  4. The next horizontal row specifies the units used for each parameter. The most common units are parts per million (PPM), microgram per cubic meter (uG/M3), degrees centigrade (DEG C), parts per billion (PPB), miles per hour (MPH) and compass degrees (DEG).
  5. The hourly averages are displayed in columns below each parameter's name. Each average is recorded in military time at the start time for each averaging block. For example, the 00 time row contains the averages for the time block 00:00 to 01:00 and the data from the last hour of  the day is recorded in row 23.
  6. Statistical data for each column appears at the bottom of the section. Below this is a list of status flags. These flags are used to indicate various problems. The most common flags are "D" (instrument disabled, usually used during weekly checks of instrument performance), "B" (bad status, usually because of instrument malfunction), "R" (a suspicious rate of change in the data from one hour to the next), or "P" (indicates a power outage during the reporting period).
  7. To help you interpret the data, a complete description of the Criteria Pollutant Standards is available.