Air Monitoring Data & AQI

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

Issued: Monday, December 22, 2025, 2:32 PM

Monday and 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, evening temperature inversions 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 in most locations on both days. Christmas Eve, as the high pressure system moves directly over the Bayou State, light and variable winds will allow pollutants to accumulate. Furthermore, an overnight inversion will confine pollutants to the lower levels of the atmosphere, and 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.

Baton Rouge

 Monday Tuesday Wednesday
Ozone 32 - Good 37 - Good 42 - Good
PM25 53 - Moderate 56 - Moderate 58 - Moderate

Alexandria

 Monday Tuesday Wednesday
Ozone 30 - Good 33 - Good 36 - Good
PM25 39 - Good 44 - Good 53 - Moderate

Lake Charles

 Monday Tuesday Wednesday
Ozone 22 - Good 31 - Good 34 - Good
PM25 56 - Moderate 53 - Moderate 56 - Moderate

Lafayette

 Monday Tuesday Wednesday
Ozone 31 - Good 35 - Good 39 - Good
PM25 39 - Good 50 - Good 53 - Moderate

Monroe

 Monday Tuesday Wednesday
Ozone 23 - Good 30 - Good 33 - Good
PM25 33 - Good 39 - Good 50 - Good

New Orleans

 Monday Tuesday Wednesday
Ozone 31 - Good 36 - Good 40 - Good
PM25 44 - Good 53 - Moderate 55 - Moderate

Shreveport

 Monday Tuesday Wednesday
Ozone 21 - Good 31 - Good 38 - Good
PM25 55 - Moderate 53 - Moderate 56 - Moderate

Thibodaux

 Monday Tuesday Wednesday
Ozone 31 - Good 36 - Good 39 - Good
PM25 39 - Good 50 - Good 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.