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

Issued: Saturday, October 17, 2026, 2:30 PM

Saturday, as a cold front departs to the southeast and surface high pressure builds to the north, periods of moderate to gusty northeasterly winds will keep pollutants well dispersed. Furthermore, cooler temperatures will limit ozone production over the Bayou State. Therefore, AQI levels will be Good statewide. Sunday and Monday, winds will shift to east-northeasterly and weaken, reducing pollutant dispersion over Louisiana. Additionally, mostly sunny skies will aid ozone formation. However, cool temperatures will keep ozone production in check, and pollutant carryover from day to day will be low. As a result, AQI levels will be Good to high-Good.

Baton Rouge

 Saturday Sunday Monday
Ozone 34 - Good 43 - Good 45 - Good
PM25 28 - Good 44 - Good 50 - Good

Alexandria

 Saturday Sunday Monday
Ozone 30 - Good 36 - Good 39 - Good
PM25 28 - Good 33 - Good 39 - Good

Lake Charles

 Saturday Sunday Monday
Ozone 31 - Good 39 - Good 42 - Good
PM25 22 - Good 39 - Good 44 - Good

Lafayette

 Saturday Sunday Monday
Ozone 32 - Good 37 - Good 41 - Good
PM25 22 - Good 39 - Good 44 - Good

Monroe

 Saturday Sunday Monday
Ozone 29 - Good 33 - Good 38 - Good
PM25 17 - Good 33 - Good 39 - Good

New Orleans

 Saturday Sunday Monday
Ozone 33 - Good 42 - Good 44 - Good
PM25 22 - Good 44 - Good 50 - Good

Shreveport

 Saturday Sunday Monday
Ozone 31 - Good 36 - Good 39 - Good
PM25 22 - Good 39 - Good 44 - Good

Thibodaux

 Saturday Sunday Monday
Ozone 33 - Good 40 - Good 44 - Good
PM25 22 - Good 39 - 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.