Air Monitoring Data & AQI

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Ozone and PM2.5 Air Quality Index (AQI) Forecast

Issued: Monday, September 15, 2025, 2:34 PM

Monday through Wednesday, as upper-level high pressure persists, mostly sunny skies and warm temperatures will continue to support ozone production across Louisiana. Furthermore, calm to light winds will allow thin smoke and other pollutants to accumulate over the state, increasing particle concentrations and further enhancing ozone formation. Therefore, despite scattered clouds and isolated showers developing each afternoon, AQI levels will be mid- to high-Moderate in most cities on all three days.

Baton Rouge

 Monday Tuesday Wednesday
Ozone 100 - Moderate 93 - Moderate 87 - Moderate
PM25 62 - Moderate 62 - Moderate 60 - Moderate

Alexandria

 Monday Tuesday Wednesday
Ozone 71 - Moderate 74 - Moderate 67 - Moderate
PM25 56 - Moderate 62 - Moderate 64 - Moderate

Lake Charles

 Monday Tuesday Wednesday
Ozone 80 - Moderate 87 - Moderate 84 - Moderate
PM25 60 - Moderate 60 - Moderate 58 - Moderate

Lafayette

 Monday Tuesday Wednesday
Ozone 77 - Moderate 77 - Moderate 67 - Moderate
PM25 62 - Moderate 62 - Moderate 60 - Moderate

Monroe

 Monday Tuesday Wednesday
Ozone 64 - Moderate 71 - Moderate 67 - Moderate
PM25 55 - Moderate 62 - Moderate 64 - Moderate

New Orleans

 Monday Tuesday Wednesday
Ozone 90 - Moderate 93 - Moderate 87 - Moderate
PM25 56 - Moderate 56 - Moderate 55 - Moderate

Shreveport

 Monday Tuesday Wednesday
Ozone 77 - Moderate 84 - Moderate 80 - Moderate
PM25 56 - Moderate 62 - Moderate 66 - Moderate

Thibodaux

 Monday Tuesday Wednesday
Ozone 67 - Moderate 77 - Moderate 71 - Moderate
PM25 55 - Moderate 55 - Moderate 53 - Moderate

More Information About Understanding AQI Information

The AQI is an index for reporting daily air quality. It tells you how clean or unhealthy your air is, and what associated health effects might be a concern. The AQI focuses on health effects you may experience within a few hours or days after breathing unhealthy air. The following chart provides information regarding the AQI determinations:

Category AQI Value What This Means
Good 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate 51-100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups 101-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy 151-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 201-300 Health warnings of emergency conditions. The entire population is more likely to be affected.
Hazardous 301-500 Health alert: everyone may experience more serious health effects.

Any questions about interpreting this monitoring data should be directed to the DEQ Customer Services Section at 1-866-896-5337.

TO REPORT ENVIRONMENTAL CONCERNS, INCLUDING ODORS, CONTACT THE DEQ SINGLE POINT OF CONTACT (SPOC) - 225-219-3640 or Toll Free 1-888-763-5424. In the event of an environmental emergency, citizens are encouraged to first contact their local authorities - police, sheriff, fire department, etc. Otherwise citizens and the regulated community can contact the SPOC line to report environmental concerns during business hours, 8 a.m. - 4:30 p.m., Monday through Friday at the number listed above. To report a concern outside of business hours call 225-342-1234 or the toll free number. Concerns include spills, releases, odors, fish kills, open burning, waste tires and any other types of environmental incidents. Citizens can report the incident online.

The data has not been quality reviewed or validated. Continuous PM2.5 readings shown are not NAAQS comparable.