Air Monitoring Data & AQI

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

Issued: Saturday, January 31, 2026, 2:30 PM

Saturday, a deep trough of low pressure aloft will aid atmospheric mixing across the region. In addition, gusty northerly surface winds will gradually transport clean air into Louisiana, resulting in Good AQI levels statewide. Sunday, as a surface high-pressure system moves over Louisiana, calm to light westerly to west-southwesterly winds will limit dispersion. In addition, cold morning temperatures will produce an inversion, confining pollutants near the ground. However, carryover from the prior day will be low, yielding Good to high-Good AQI levels statewide. Monday, upper-level high pressure over the state will inhibit atmospheric mixing. At the surface, a morning inversion will trap pollutants at ground level. Additionally, calm to light southerly to southwesterly winds will hinder dispersion. These conditions will result in low-Moderate AQI levels in most cities.

Baton Rouge

 Saturday Sunday Monday
Ozone 40 - Good 42 - Good 45 - Good
PM25 39 - Good 44 - Good 56 - Moderate

Alexandria

 Saturday Sunday Monday
Ozone 36 - Good 38 - Good 42 - Good
PM25 22 - Good 28 - Good 50 - Good

Lake Charles

 Saturday Sunday Monday
Ozone 38 - Good 40 - Good 44 - Good
PM25 39 - Good 44 - Good 55 - Moderate

Lafayette

 Saturday Sunday Monday
Ozone 37 - Good 39 - Good 43 - Good
PM25 17 - Good 22 - Good 44 - Good

Monroe

 Saturday Sunday Monday
Ozone 36 - Good 38 - Good 42 - Good
PM25 39 - Good 44 - Good 53 - Moderate

New Orleans

 Saturday Sunday Monday
Ozone 40 - Good 42 - Good 45 - Good
PM25 28 - Good 33 - Good 53 - Moderate

Shreveport

 Saturday Sunday Monday
Ozone 33 - Good 35 - Good 39 - Good
PM25 33 - Good 39 - Good 53 - Moderate

Thibodaux

 Saturday Sunday Monday
Ozone 38 - Good 40 - Good 44 - Good
PM25 33 - Good 39 - Good 55 - 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.