Air Monitoring Data & AQI

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

Issued: Thursday, December 11, 2025, 2:32 PM

Thursday and Friday, periods of light and variable winds will hinder dispersion each day as a surface ridge of high pressure moves southward across the state. In addition, morning and evening temperature inversions will confine pollutants near the surface, while areas of morning fog promote particle formation on Friday. Furthermore, smoke from agricultural fires will contribute to particle levels, leading to high-Good to low-Moderate AQI levels on both days. Saturday, as a cold front approaches from the north, calm to light south-southwesterly winds will hinder dispersion for much of the day across Louisiana. Furthermore, low-level mixing will be limited across western and northern Louisiana, trapping pollutants near the ground. Therefore, AQI levels will remain high-Good to low-Moderate in most locations.

Baton Rouge

 Thursday Friday Saturday
Ozone 33 - Good 35 - Good 37 - Good
PM25 53 - Moderate 58 - Moderate 55 - Moderate

Alexandria

 Thursday Friday Saturday
Ozone 28 - Good 32 - Good 29 - Good
PM25 39 - Good 50 - Good 50 - Good

Lake Charles

 Thursday Friday Saturday
Ozone 32 - Good 34 - Good 31 - Good
PM25 56 - Moderate 60 - Moderate 53 - Moderate

Lafayette

 Thursday Friday Saturday
Ozone 31 - Good 34 - Good 35 - Good
PM25 44 - Good 50 - Good 44 - Good

Monroe

 Thursday Friday Saturday
Ozone 24 - Good 32 - Good 27 - Good
PM25 39 - Good 44 - Good 56 - Moderate

New Orleans

 Thursday Friday Saturday
Ozone 33 - Good 38 - Good 41 - Good
PM25 44 - Good 53 - Moderate 53 - Moderate

Shreveport

 Thursday Friday Saturday
Ozone 26 - Good 39 - Good 31 - Good
PM25 50 - Good 53 - Moderate 56 - Moderate

Thibodaux

 Thursday Friday Saturday
Ozone 28 - Good 31 - Good 32 - Good
PM25 39 - Good 50 - Good 33 - 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.