Air Monitoring Data & AQI

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

Issued: Sunday, April 27, 2025, 2:30 PM

Sunday, an upper-level ridge of high pressure will hinder atmospheric mixing over Louisiana. Furthermore, mostly sunny skies and highs in the mid- to upper-80s will enhance ozone production. In addition, light southerly winds will limit dispersion and gradually bring thin-density smoke into the state. These conditions will lead to high-Good to low-Moderate AQI levels in most locations, with mid-Moderate AQI levels expected in Baton Rouge and New Orleans. Monday and Tuesday, mostly sunny skies and temperatures in the mid- to upper-80s will continue to support ozone formation across the Bayou State. Additionally, calm morning winds will lead to pollutant build-up each day, especially over the southeastern portion of the state. However, south-southeasterly winds will strengthen each afternoon as an area of low pressure develops to the west, enhancing pollutant dispersion. These conditions will keep AQI levels high-Good to low-Moderate in most locations on both days.

Baton Rouge

 Sunday Monday Tuesday
Ozone 84 - Moderate 67 - Moderate 58 - Moderate
PM25 55 - Moderate 53 - Moderate 50 - Good

Alexandria

 Sunday Monday Tuesday
Ozone 49 - Good 44 - Good 40 - Good
PM25 44 - Good 39 - Good 33 - Good

Lake Charles

 Sunday Monday Tuesday
Ozone 44 - Good 43 - Good 40 - Good
PM25 50 - Good 50 - Good 44 - Good

Lafayette

 Sunday Monday Tuesday
Ozone 45 - Good 44 - Good 42 - Good
PM25 50 - Good 50 - Good 44 - Good

Monroe

 Sunday Monday Tuesday
Ozone 44 - Good 42 - Good 40 - Good
PM25 39 - Good 33 - Good 33 - Good

New Orleans

 Sunday Monday Tuesday
Ozone 67 - Moderate 58 - Moderate 51 - Moderate
PM25 53 - Moderate 50 - Good 44 - Good

Shreveport

 Sunday Monday Tuesday
Ozone 44 - Good 44 - Good 40 - Good
PM25 39 - Good 39 - Good 33 - Good

Thibodaux

 Sunday Monday Tuesday
Ozone 42 - Good 41 - Good 39 - Good
PM25 53 - Moderate 50 - Good 44 - 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.