Air Monitoring Data & AQI

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

Issued: Sunday, December 14, 2025, 2:33 PM

Sunday, as a cold front departs to the south, moderate and gusty north-northeasterly winds will develop. These winds will increase dispersion and carry clean, cool air into the Bayou State. As a result, AQI levels will be Good to high-Good. Monday, as surface high pressure moves southward into the Bayou State, northeasterly winds will weaken, becoming calm in the afternoon and evening. Additionally, morning and evening temperatures in the mid-20s to low-30s will produce a strong inversion, trapping pollutants in the lower levels of the atmosphere. These conditions will lead to high-Good to low-Moderate AQI levels statewide. Tuesday, a strong temperature inversion will persist through the morning hours, reducing atmospheric mixing. Furthermore, calm to light southeasterly winds will allow pollutants to accumulate over the Bayou State throughout the day. As a result, AQI levels will be low-Moderate in most cities.

Baton Rouge

 Sunday Monday Tuesday
Ozone 31 - Good 34 - Good 37 - Good
PM25 50 - Good 53 - Moderate 56 - Moderate

Alexandria

 Sunday Monday Tuesday
Ozone 28 - Good 31 - Good 33 - Good
PM25 33 - Good 50 - Good 53 - Moderate

Lake Charles

 Sunday Monday Tuesday
Ozone 24 - Good 30 - Good 33 - Good
PM25 50 - Good 50 - Good 55 - Moderate

Lafayette

 Sunday Monday Tuesday
Ozone 30 - Good 33 - Good 36 - Good
PM25 33 - Good 44 - Good 53 - Moderate

Monroe

 Sunday Monday Tuesday
Ozone 31 - Good 33 - Good 36 - Good
PM25 33 - Good 44 - Good 50 - Good

New Orleans

 Sunday Monday Tuesday
Ozone 25 - Good 31 - Good 33 - Good
PM25 50 - Good 50 - Good 55 - Moderate

Shreveport

 Sunday Monday Tuesday
Ozone 31 - Good 35 - Good 37 - Good
PM25 39 - Good 50 - Good 50 - Good

Thibodaux

 Sunday Monday Tuesday
Ozone 22 - Good 31 - Good 33 - Good
PM25 44 - Good 50 - Good 53 - 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.