Air Monitoring Data & AQI

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

Issued: Saturday, December 27, 2025, 2:32 PM

Saturday, as surface high pressure moves into the eastern Gulf, light to moderate southwesterly winds will aid dispersion. Additionally, carryover from the previous day will be low. Therefore, AQI levels will be Good to high-Good. Sunday, a morning inversion will confine pollutants near the surface, while fog and high humidity promotes particle production in the southern half of the state. However, mixing and dispersion will improve throughout the day as a cold front moves toward the Bayou State. Thus, AQI levels will remain Good to high-Good. Monday, moderate and gusty northerly to north-northwesterly winds behind the departing cold front will transport cleaner, cooler air into Louisiana. As a result, AQI levels will be Good statewide.

Baton Rouge

 Saturday Sunday Monday
Ozone 38 - Good 37 - Good 28 - Good
PM25 39 - Good 44 - Good 28 - Good

Alexandria

 Saturday Sunday Monday
Ozone 33 - Good 32 - Good 23 - Good
PM25 39 - Good 33 - Good 22 - Good

Lake Charles

 Saturday Sunday Monday
Ozone 38 - Good 37 - Good 28 - Good
PM25 33 - Good 33 - Good 22 - Good

Lafayette

 Saturday Sunday Monday
Ozone 36 - Good 35 - Good 26 - Good
PM25 33 - Good 33 - Good 22 - Good

Monroe

 Saturday Sunday Monday
Ozone 29 - Good 28 - Good 19 - Good
PM25 28 - Good 28 - Good 17 - Good

New Orleans

 Saturday Sunday Monday
Ozone 38 - Good 37 - Good 28 - Good
PM25 44 - Good 39 - Good 28 - Good

Shreveport

 Saturday Sunday Monday
Ozone 30 - Good 29 - Good 19 - Good
PM25 44 - Good 39 - Good 28 - Good

Thibodaux

 Saturday Sunday Monday
Ozone 35 - Good 34 - Good 25 - Good
PM25 33 - Good 33 - Good 22 - Good

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.