Air Monitoring Data & AQI

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

Issued: Tuesday, November 11, 2025, 2:35 PM

Tuesday, winds will strengthen out of the south in the afternoon as surface high pressure departs eastward. These winds will aid pollutant dispersion, yielding Good to high-Good AQI levels statewide. Wednesday, a strong early morning inversion will trap pollutants at ground level across Louisiana. Furthermore, mostly sunny skies and warmer temperatures will enhance ozone production. However, southwesterly winds will develop by midday, increasing mixing and dispersion. As a result, AQI levels will be high-Good to low-Moderate in most locations. Thursday, a morning inversion will confine pollutants at the surface. Additionally, calm to light southeasterly winds will allow pollutants to accumulate as surface high pressure moves into the northern Gulf. Furthermore, mostly sunny and warm conditions will promote ozone formation. These conditions will yield low-Moderate AQI levels in most cities.

Baton Rouge

 Tuesday Wednesday Thursday
Ozone 35 - Good 42 - Good 44 - Good
PM25 39 - Good 50 - Good 56 - Moderate

Alexandria

 Tuesday Wednesday Thursday
Ozone 31 - Good 38 - Good 41 - Good
PM25 33 - Good 44 - Good 55 - Moderate

Lake Charles

 Tuesday Wednesday Thursday
Ozone 36 - Good 42 - Good 44 - Good
PM25 44 - Good 53 - Moderate 56 - Moderate

Lafayette

 Tuesday Wednesday Thursday
Ozone 33 - Good 40 - Good 43 - Good
PM25 33 - Good 44 - Good 55 - Moderate

Monroe

 Tuesday Wednesday Thursday
Ozone 31 - Good 38 - Good 41 - Good
PM25 28 - Good 39 - Good 50 - Good

New Orleans

 Tuesday Wednesday Thursday
Ozone 35 - Good 41 - Good 44 - Good
PM25 28 - Good 39 - Good 53 - Moderate

Shreveport

 Tuesday Wednesday Thursday
Ozone 34 - Good 41 - Good 44 - Good
PM25 44 - Good 53 - Moderate 58 - Moderate

Thibodaux

 Tuesday Wednesday Thursday
Ozone 35 - Good 41 - Good 44 - Good
PM25 22 - Good 33 - Good 50 - 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.