Air Monitoring Data & AQI

« Back to DEQ's Main Website

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

Issued: Monday, October 20, 2025, 2:32 PM

Monday, a temperature inversion will reduce mixing early in the day, confining pollutants to the lower levels of the atmosphere. In addition, light southeasterly winds will limit dispersion over much of the state, while sunny skies and high temperatures in the low-80s support ozone development. Furthermore, thin smoke from agricultural fires may contribute to particle levels and ozone precursors. As a result, AQI levels will be high-Good to low-Moderate. Tuesday, as a weak cold front traverses the Bayou State, scattered showers and thunderstorms will enhance mixing and reduce ozone formation. Additionally, light to moderate northerly winds behind the front will disperse pollutants and carry clean air into the region. Therefore, despite periods of sunshine and warm temperatures aiding ozone formation in some areas, AQI levels will remain high-Good to low-Moderate. Wednesday, as a surface high pressure system moves across northern Louisiana, light northeasterly winds will limit dispersion over most of the state. In addition, sunny skies will support ozone production, and smoke from regional agricultural fires may increase particle concentrations in some areas. However, slightly cooler temperatures will keep ozone production in check. As a result, AQI levels will continue to be high-Good to low-Moderate.

Baton Rouge

 Monday Tuesday Wednesday
Ozone 51 - Moderate 64 - Moderate 51 - Moderate
PM25 39 - Good 50 - Good 55 - Moderate

Alexandria

 Monday Tuesday Wednesday
Ozone 46 - Good 44 - Good 45 - Good
PM25 33 - Good 39 - Good 44 - Good

Lake Charles

 Monday Tuesday Wednesday
Ozone 45 - Good 44 - Good 45 - Good
PM25 39 - Good 44 - Good 50 - Good

Lafayette

 Monday Tuesday Wednesday
Ozone 54 - Moderate 50 - Good 48 - Good
PM25 33 - Good 44 - Good 50 - Good

Monroe

 Monday Tuesday Wednesday
Ozone 42 - Good 39 - Good 44 - Good
PM25 33 - Good 39 - Good 50 - Good

New Orleans

 Monday Tuesday Wednesday
Ozone 48 - Good 64 - Moderate 44 - Good
PM25 39 - Good 50 - Good 53 - Moderate

Shreveport

 Monday Tuesday Wednesday
Ozone 43 - Good 42 - Good 46 - Good
PM25 39 - Good 39 - Good 50 - Good

Thibodaux

 Monday Tuesday Wednesday
Ozone 43 - Good 47 - Good 45 - Good
PM25 33 - Good 44 - 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.