Air Monitoring Data & AQI

« Back to DEQ's Main Website

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

Issued: Sunday, May 11, 2025, 2:32 PM

Sunday, a surface low pressure system over Louisiana will produce partly to mostly cloudy skies and scattered showers, limiting ozone production. In addition, pollutant carryover from Saturday will be low. Therefore, despite lighter winds reducing dispersion, AQI levels will be Good to high-Good. Monday, as the surface low departs and high pressure builds over Texas, light westerly to west-southwesterly winds will limit dispersion. In addition, increasing sunshine and warmer temperatures will aid ozone production. These conditions will yield high-Good to low-Moderate AQI levels in most cities. Tuesday, partly sunny skies and temperatures around 85-90F will enhance ozone development. In addition, southerly to south-southwesterly winds will transport pollutants into the Bayou State, increasing particle concentrations. As a result, AQI levels will be low- to mid-Moderate in most locations.

Baton Rouge

 Sunday Monday Tuesday
Ozone 50 - Good 58 - Moderate 71 - Moderate
PM25 39 - Good 44 - Good 53 - Moderate

Alexandria

 Sunday Monday Tuesday
Ozone 40 - Good 44 - Good 49 - Good
PM25 28 - Good 33 - Good 44 - Good

Lake Charles

 Sunday Monday Tuesday
Ozone 40 - Good 46 - Good 51 - Moderate
PM25 28 - Good 39 - Good 44 - Good

Lafayette

 Sunday Monday Tuesday
Ozone 45 - Good 49 - Good 58 - Moderate
PM25 44 - Good 50 - Good 55 - Moderate

Monroe

 Sunday Monday Tuesday
Ozone 34 - Good 41 - Good 45 - Good
PM25 22 - Good 28 - Good 39 - Good

New Orleans

 Sunday Monday Tuesday
Ozone 46 - Good 51 - Moderate 67 - Moderate
PM25 28 - Good 39 - Good 50 - Good

Shreveport

 Sunday Monday Tuesday
Ozone 35 - Good 43 - Good 47 - Good
PM25 22 - Good 28 - Good 39 - Good

Thibodaux

 Sunday Monday Tuesday
Ozone 42 - Good 47 - Good 54 - Moderate
PM25 39 - Good 44 - Good 53 - 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.