Air Monitoring Data & AQI

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

Issued: Tuesday, December 9, 2025, 2:32 PM

Tuesday, calm to light southerly winds will limit dispersion across Louisiana as a surface high-pressure system slowly traverses the state. In addition, areas of fog will promote particle formation. As a result, AQI levels will be low-Moderate. Wednesday, a temperature inversion will persist through the morning hours, confining pollutants near the surface. However, a weak cold front will produce moderate westerly to northwesterly winds during the day, gradually dispersing pollutants and carrying cleaner air into the Bayou State. As a result, AQI levels will be high-Good in most locations, with low-Moderate AQI levels continuing in Baton Rouge and New Orleans. Thursday, calm to light southerly winds will hinder dispersion throughout the day as the next surface ridge of high pressure settles over the state. However, low pollutant carryover behind the departing front will allow AQI levels to remain Good to high-Good.

Baton Rouge

 Tuesday Wednesday Thursday
Ozone 30 - Good 31 - Good 33 - Good
PM25 55 - Moderate 53 - Moderate 50 - Good

Alexandria

 Tuesday Wednesday Thursday
Ozone 26 - Good 28 - Good 26 - Good
PM25 53 - Moderate 39 - Good 33 - Good

Lake Charles

 Tuesday Wednesday Thursday
Ozone 26 - Good 27 - Good 29 - Good
PM25 55 - Moderate 50 - Good 39 - Good

Lafayette

 Tuesday Wednesday Thursday
Ozone 26 - Good 29 - Good 31 - Good
PM25 53 - Moderate 44 - Good 39 - Good

Monroe

 Tuesday Wednesday Thursday
Ozone 28 - Good 26 - Good 23 - Good
PM25 53 - Moderate 39 - Good 33 - Good

New Orleans

 Tuesday Wednesday Thursday
Ozone 30 - Good 32 - Good 35 - Good
PM25 53 - Moderate 53 - Moderate 44 - Good

Shreveport

 Tuesday Wednesday Thursday
Ozone 24 - Good 25 - Good 28 - Good
PM25 55 - Moderate 39 - Good 39 - Good

Thibodaux

 Tuesday Wednesday Thursday
Ozone 26 - Good 28 - Good 26 - Good
PM25 53 - Moderate 39 - 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.