Air Monitoring Data & AQI

« Back to DEQ's Main Website

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

Issued: Tuesday, November 18, 2025, 2:36 PM

Tuesday, as an upper-level ridge of high pressure builds over the Bayou State, atmospheric mixing will decrease. Furthermore, areas of morning fog and mist will enhance particle production. However, as a low pressure system passes to the north of Louisiana, periods of moderate southerly to southwesterly winds will disperse pollutants and bring cleaner air into the state. As a result, AQI levels will be Good to high-Good. Wednesday, as the upper-level ridge of high pressure strengthens over the Bayou State, atmospheric mixing will be 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. Thursday, calm morning winds will allow pollutants to linger across the Bayou State. However, as upper-level high pressure departs to the east and a trough of low pressure approaches from the west, atmospheric mixing will increase over Louisiana. Furthermore, surface low pressure developing over the southern Plains will generate light to moderate southerly winds in Louisiana, increasing pollutant dispersion. As a result, AQI levels will lower to Good statewide.

Baton Rouge

 Tuesday Wednesday Thursday
Ozone 41 - Good 48 - Good 45 - Good
PM25 44 - Good 56 - Moderate 50 - Good

Alexandria

 Tuesday Wednesday Thursday
Ozone 32 - Good 38 - Good 34 - Good
PM25 39 - Good 50 - Good 39 - Good

Lake Charles

 Tuesday Wednesday Thursday
Ozone 34 - Good 41 - Good 36 - Good
PM25 33 - Good 50 - Good 39 - Good

Lafayette

 Tuesday Wednesday Thursday
Ozone 35 - Good 42 - Good 39 - Good
PM25 33 - Good 44 - Good 39 - Good

Monroe

 Tuesday Wednesday Thursday
Ozone 27 - Good 37 - Good 32 - Good
PM25 33 - Good 44 - Good 33 - Good

New Orleans

 Tuesday Wednesday Thursday
Ozone 42 - Good 48 - Good 45 - Good
PM25 39 - Good 55 - Moderate 50 - Good

Shreveport

 Tuesday Wednesday Thursday
Ozone 32 - Good 37 - Good 34 - Good
PM25 44 - Good 53 - Moderate 44 - Good

Thibodaux

 Tuesday Wednesday Thursday
Ozone 36 - Good 41 - Good 38 - Good
PM25 33 - Good 44 - 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.