Air Monitoring Data & AQI

« Back to DEQ's Main Website

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

Issued: Monday, November 17, 2025, 2:32 PM

Monday and Tuesday, as an upper-level ridge of high pressure builds over the Bayou State, atmospheric mixing will decrease. Furthermore, areas of overnight and morning fog and mist will enhance particle production. However, as a low pressure system passes to the north of Louisiana, periods of southerly to southeasterly winds will aid pollutant dispersion each day. As a result, AQI levels will be Good to low-Moderate on both days. Wednesday, as the upper-level ridge of high pressure strengthens over the Bayou State, atmospheric mixing will be further reduced. Additionally, mostly sunny skies and temperatures warming into the low-80s will support ozone formation. Furthermore, calm to light southerly winds will inhibit dispersion throughout the day, leading to pollutant build-up. Therefore, AQI levels will be high-Good to low-Moderate.

Baton Rouge

 Monday Tuesday Wednesday
Ozone 45 - Good 45 - Good 49 - Good
PM25 55 - Moderate 53 - Moderate 56 - Moderate

Alexandria

 Monday Tuesday Wednesday
Ozone 37 - Good 34 - Good 39 - Good
PM25 50 - Good 39 - Good 50 - Good

Lake Charles

 Monday Tuesday Wednesday
Ozone 33 - Good 32 - Good 39 - Good
PM25 28 - Good 33 - Good 44 - Good

Lafayette

 Monday Tuesday Wednesday
Ozone 37 - Good 35 - Good 41 - Good
PM25 28 - Good 33 - Good 50 - Good

Monroe

 Monday Tuesday Wednesday
Ozone 34 - Good 32 - Good 37 - Good
PM25 44 - Good 33 - Good 44 - Good

New Orleans

 Monday Tuesday Wednesday
Ozone 45 - Good 44 - Good 49 - Good
PM25 50 - Good 50 - Good 55 - Moderate

Shreveport

 Monday Tuesday Wednesday
Ozone 32 - Good 34 - Good 36 - Good
PM25 55 - Moderate 44 - Good 50 - Good

Thibodaux

 Monday Tuesday Wednesday
Ozone 34 - Good 33 - Good 39 - Good
PM25 33 - Good 39 - 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.