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

Issued: Monday, May 11, 2026, 2:33 PM

Monday, as a cold front advances southward through the Bayou State, mostly cloudy skies, thunderstorms, and rain showers will inhibit ozone production. Additionally, light to moderate north-northeasterly winds behind the front will disperse pollutants and bring clean air into the region, leading to Good AQI levels statewide. Tuesday, increasing sunshine and temperatures in the low-80s will enhance ozone formation across Louisiana. Furthermore, weakening northeasterly winds will reduce dispersion, leading to pollutant build-up. As a result, AQI levels will be high-Good in most cities. Wednesday, calm morning winds will allow ozone precursors and other pollutants to accumulate in Louisiana. Furthermore, mostly sunny skies and warm temperatures will support ozone production. Therefore, despite light northerly winds increasing pollutant dispersion in the afternoon, AQI levels will be high-Good to low-Moderate.

Baton Rouge

 Monday Tuesday Wednesday
Ozone 38 - Good 50 - Good 54 - Moderate
PM25 44 - Good 50 - Good 53 - Moderate

Alexandria

 Monday Tuesday Wednesday
Ozone 34 - Good 42 - Good 46 - Good
PM25 39 - Good 44 - Good 50 - Good

Lake Charles

 Monday Tuesday Wednesday
Ozone 31 - Good 44 - Good 51 - Moderate
PM25 39 - Good 44 - Good 50 - Good

Lafayette

 Monday Tuesday Wednesday
Ozone 32 - Good 44 - Good 46 - Good
PM25 33 - Good 44 - Good 50 - Good

Monroe

 Monday Tuesday Wednesday
Ozone 33 - Good 44 - Good 49 - Good
PM25 44 - Good 44 - Good 50 - Good

New Orleans

 Monday Tuesday Wednesday
Ozone 36 - Good 50 - Good 54 - Moderate
PM25 39 - Good 50 - Good 53 - Moderate

Shreveport

 Monday Tuesday Wednesday
Ozone 32 - Good 50 - Good 54 - Moderate
PM25 44 - Good 50 - Good 53 - Moderate

Thibodaux

 Monday Tuesday Wednesday
Ozone 28 - Good 48 - Good 51 - Moderate
PM25 39 - Good 44 - Good 44 - 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.