Air Monitoring Data & AQI

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

Issued: Tuesday, December 23, 2025, 2:32 PM

Tuesday, light southerly to southeasterly winds will limit pollutant dispersion as a surface ridge of high pressure gradually stretches across the state from the east. In addition, an evening temperature inversion will inhibit atmospheric mixing, and overnight fog and mist will enhance particle formation. These conditions will lead to high-Good to low-Moderate AQI levels statewide. Christmas Eve and Christmas Day, as the high pressure system gradually moves across southern Louisiana, calm to light southerly winds will lead to pollutant accumulation. Furthermore, overnight temperature inversions will confine pollutants to the lower levels of the atmosphere. Additionally, increased residential emissions associated with the holiday will contribute to particle levels. As a result, AQI levels will increase to low-Moderate in most cities on both days.

Baton Rouge

 Tuesday Wednesday Thursday
Ozone 44 - Good 46 - Good 44 - Good
PM25 53 - Moderate 58 - Moderate 60 - Moderate

Alexandria

 Tuesday Wednesday Thursday
Ozone 33 - Good 41 - Good 38 - Good
PM25 44 - Good 50 - Good 53 - Moderate

Lake Charles

 Tuesday Wednesday Thursday
Ozone 32 - Good 37 - Good 35 - Good
PM25 44 - Good 53 - Moderate 55 - Moderate

Lafayette

 Tuesday Wednesday Thursday
Ozone 42 - Good 44 - Good 42 - Good
PM25 39 - Good 50 - Good 53 - Moderate

Monroe

 Tuesday Wednesday Thursday
Ozone 32 - Good 37 - Good 35 - Good
PM25 39 - Good 44 - Good 50 - Good

New Orleans

 Tuesday Wednesday Thursday
Ozone 42 - Good 46 - Good 44 - Good
PM25 50 - Good 55 - Moderate 56 - Moderate

Shreveport

 Tuesday Wednesday Thursday
Ozone 32 - Good 38 - Good 35 - Good
PM25 50 - Good 53 - Moderate 55 - Moderate

Thibodaux

 Tuesday Wednesday Thursday
Ozone 40 - Good 44 - Good 43 - Good
PM25 44 - Good 53 - 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.