Air Monitoring Data & AQI

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

Issued: Thursday, November 20, 2025, 2:32 PM

Thursday, as upper-level high pressure departs to the east and an aloft trough of low pressure approaches from the west, atmospheric mixing will increase. In addition, light to moderate southerly winds will aid pollutant dispersion. However, scattered agricultural fires may influence particle concentrations in some areas. Therefore, AQI levels will be low-Moderate in Baton Rouge, with Good to high-Good AQI levels elsewhere. Friday, as the upper-level trough passes north of Louisiana, strengthening west-southwesterly surface winds will aid pollutant dispersion. Additionally, rain showers and scattered thunderstorms will enhance mixing and reduce ozone formation. These conditions will lead to Good AQI levels statewide. Saturday, patchy morning fog will enhance particle formation. However, a cold front traversing the Bayou State will shift winds to west-northwesterly, aiding dispersion. In addition, partly cloudy skies will inhibit ozone production. Thus, AQI levels will be Good to high-Good statewide.

Baton Rouge

 Thursday Friday Saturday
Ozone 42 - Good 38 - Good 40 - Good
PM25 53 - Moderate 39 - Good 50 - Good

Alexandria

 Thursday Friday Saturday
Ozone 38 - Good 34 - Good 36 - Good
PM25 33 - Good 22 - Good 33 - Good

Lake Charles

 Thursday Friday Saturday
Ozone 35 - Good 31 - Good 33 - Good
PM25 39 - Good 28 - Good 39 - Good

Lafayette

 Thursday Friday Saturday
Ozone 39 - Good 35 - Good 37 - Good
PM25 39 - Good 28 - Good 39 - Good

Monroe

 Thursday Friday Saturday
Ozone 38 - Good 34 - Good 36 - Good
PM25 44 - Good 33 - Good 39 - Good

New Orleans

 Thursday Friday Saturday
Ozone 47 - Good 40 - Good 42 - Good
PM25 44 - Good 33 - Good 44 - Good

Shreveport

 Thursday Friday Saturday
Ozone 31 - Good 28 - Good 30 - Good
PM25 44 - Good 33 - Good 39 - Good

Thibodaux

 Thursday Friday Saturday
Ozone 43 - Good 37 - Good 39 - Good
PM25 39 - Good 28 - Good 39 - 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.