Yesterdays Complete Saint Louis, Kansas City and Springfield Air Quality Index (AQI) Report

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. 

Load/Save the ASCII Report File TXT

Users Guide

This complete Air Quality Index Report (AQI) for Kansas City,  St. Louis and Springfield areas is updated daily by 7:30 a.m. Central Standard Time.  All data is recorded using Central Standard Time, regardless of local time changes to daylight-saving time.

This report, using the complete data from yesterday, is  the official Air Quality Index Report for yesterday .  The Official AQI for any day cannot be calculated until all air pollutant data for that day is available. . A summary of this official report can be found published in the St.Louis and Kansas City news papers.

During the ozone season (April 1 to October 31) this AQI report is used to help predict the ozone levels for the current day in the St. Louis and Kansas City areas. An index of 100 represents a threshold level of pollution, which may cause health problems in normally healthy humans. However, sensitive individuals or highly active individuals may experience health effects at lower concentrations of pollutants.

Also available:

Archive of Air Quality Index Reports TXT