Air Monitoring Data & AQI

« Back to DEQ's Main Website

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

Issued: Thursday, December 18, 2025, 2:32 PM

Thursday, a passing cold front will increase vertical mixing and produce moderate and gusty westerly to northwesterly winds in the afternoon and evening, enhancing pollutant dispersion. These weather conditions will yield Good to high-Good AQI levels. Friday, a morning temperature inversion will trap pollutants near the surface. However, as surface high pressure traverses northern Louisiana, northerly to northeasterly winds across much of the state will aid dispersion and carry clean air across the region. Thus, AQI levels will be Good statewide. Saturday, a strong morning inversion will confine pollutants at the surface. Additionally, light southerly to southeasterly winds early in the day will limit dispersion and carry moisture into the state, enhancing particle production. Therefore, despite strengthening afternoon winds increasing dispersion, AQI levels will be high-Good to low-Moderate.

Baton Rouge

 Thursday Friday Saturday
Ozone 41 - Good 35 - Good 38 - Good
PM25 33 - Good 39 - Good 53 - Moderate

Alexandria

 Thursday Friday Saturday
Ozone 34 - Good 29 - Good 31 - Good
PM25 28 - Good 33 - Good 44 - Good

Lake Charles

 Thursday Friday Saturday
Ozone 35 - Good 30 - Good 32 - Good
PM25 22 - Good 33 - Good 50 - Good

Lafayette

 Thursday Friday Saturday
Ozone 37 - Good 31 - Good 34 - Good
PM25 22 - Good 33 - Good 50 - Good

Monroe

 Thursday Friday Saturday
Ozone 32 - Good 28 - Good 31 - Good
PM25 22 - Good 28 - Good 44 - Good

New Orleans

 Thursday Friday Saturday
Ozone 38 - Good 34 - Good 37 - Good
PM25 28 - Good 33 - Good 50 - Good

Shreveport

 Thursday Friday Saturday
Ozone 31 - Good 29 - Good 31 - Good
PM25 44 - Good 39 - Good 50 - Good

Thibodaux

 Thursday Friday Saturday
Ozone 38 - Good 32 - Good 35 - Good
PM25 28 - Good 33 - 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.