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

Issued: Saturday, March 21, 2026, 2:30 PM

Saturday, partly sunny skies and warm temperatures will promote ozone production. In addition, as a surface ridge of high pressure persists over the northern Gulf, periods of light southwesterly winds will limit dispersion, and smoke from localized agricultural fires may contribute to particle concentrations. However, moderate southwesterly winds will increase dispersion during the day, leading to high-Good to low-Moderate AQI levels. Sunday, light southwesterly winds will hinder dispersion during the morning and evening as a weak surface ridge of high pressure remains over the region. Furthermore, moderate southwesterly daytime winds will transport pollutants into the Bayou State from the western Gulf, while mostly sunny skies and warm temperatures aid ozone development. Therefore, AQI levels will remain high-Good to low-Moderate. Monday, light westerly winds will allow pollutants to accumulate across Louisiana throughout the day. In addition, partly sunny skies and highs in the low- to mid-80s will enhance ozone formation. These conditions will lead to low-Moderate AQI levels statewide.

Baton Rouge

 Saturday Sunday Monday
Ozone 51 - Moderate 58 - Moderate 61 - Moderate
PM25 50 - Good 50 - Good 55 - Moderate

Alexandria

 Saturday Sunday Monday
Ozone 44 - Good 43 - Good 44 - Good
PM25 39 - Good 44 - Good 53 - Moderate

Lake Charles

 Saturday Sunday Monday
Ozone 46 - Good 47 - Good 51 - Moderate
PM25 39 - Good 50 - Good 56 - Moderate

Lafayette

 Saturday Sunday Monday
Ozone 47 - Good 49 - Good 51 - Moderate
PM25 33 - Good 44 - Good 53 - Moderate

Monroe

 Saturday Sunday Monday
Ozone 42 - Good 44 - Good 48 - Good
PM25 44 - Good 50 - Good 53 - Moderate

New Orleans

 Saturday Sunday Monday
Ozone 58 - Moderate 51 - Moderate 64 - Moderate
PM25 39 - Good 44 - Good 53 - Moderate

Shreveport

 Saturday Sunday Monday
Ozone 44 - Good 43 - Good 51 - Moderate
PM25 53 - Moderate 55 - Moderate 60 - Moderate

Thibodaux

 Saturday Sunday Monday
Ozone 44 - Good 44 - Good 48 - Good
PM25 53 - Moderate 53 - Moderate 55 - 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.