Satellite Technology Reveals Potentially High Levels of Air Pollution in St. Tammany Parish

The American Lung Association today released a new report, “Something in the Air: Bridging the Air Quality Data Gap with Satellite Technology,” which utilizes satellite-derived data that reveals that St. Tammany Parish could have unhealthy levels of particle pollution. Currently, St. Tammany Parish does not have ground-based monitors that track particle pollution.

The new report highlights the potential for satellite-derived data to complement the existing U.S. air quality monitoring network. Focusing on fine particulate matter (PM2.5), one of the most harmful air pollutants to human health, this report emphasizes how emerging technologies, such as satellites, can help provide critical air quality information to underserved communities lacking official monitoring data.

St. Tammany Parish is located in the southeastern corner of Louisiana. It is part of the greater New Orleans metropolitan area, across Lake Pontchartrain to the north from the city of New Orleans. St. Tammany Parish has been part of a rapidly expanding suburban area, absorbing population growth and hurricane refugees from the urban core of New Orleans. Of the 10 parishes and one county in the New Orleans metro area, five of them are monitored, and all five got passing grades for annual particle pollution in the 2024 “State of the Air” report. Satellite data shows higher pollution levels in St. Tammany Parish compared to nearby parishes, but these estimates could be overestimated due to factors like warmer and wetter climates, especially prevalent in the southeast region. However, this may be only one factor contributing to elevated estimates of particle pollution and further investigation is warranted to get a clear picture of actual pollution levels.

“The air quality in St. Tammany Parish is influenced by local and regional industrial activities and by vehicle emissions from resident commuters and tourists using the three interstate highways that run through the parish,” said Eric Weinzettle, director of advocacy, Louisiana for the American Lung Association. “While St. Tammany Parish doesn’t have an official air quality monitor, the satellite-derived data used in this report shows concerning levels of particle pollution. Our hope is that this report results in more communities having valuable information about air quality levels so they can better protect their health.”

Key Findings of the Report

• Preliminary estimates based on satellite-derived data suggest that as many as 300 of the 2,700 counties in the U.S. with incomplete or no monitoring data for annual levels of PM2.5 in the years 2020, 2021 and 2022 had estimated levels of pollution high enough that they might have earned a failing grade in the “State of the Air” report. 
• The report highlights six unmonitored counties as examples where satellite data indicates potentially concerning levels of particle pollution: Collin, Texas; Forsyth, Georgia; Marion, Oregon; Mohave, Arizona; St. Charles, Missouri; and St. Tammany Parish, Louisiana.
  • These six counties provide only a snapshot. Air quality data from satellites and improved modeling could help uncover other unmonitored communities with high particle pollution.
• Use of satellite-derived data is not intended to replace the well-established “ground truth” of regulatory monitors, which provide highly accurate, quality-assured data needed for compliance with air quality standards.
• The future of air quality management will benefit from leveraging both ground-based monitoring and data from satellites to provide every community with the information they need to protect their health and advocate for clean air.

This report focuses on fine particle pollution, which is a mix of tiny solid and liquid particles that are in the air we breathe and are 1/30th the diameter of a strand of human hair or smaller. Particle pollution comes from wildfires, wood-burning stoves, power plants, gasoline- and diesel-engines in cars and trucks, and other sources. These microscopic particles can trigger asthma attacks, heart attacks and strokes, can cause lung cancer and can even be deadly. According to the 2024 “State of the Air” report, 65 million people lived in monitored counties that experienced unhealthy spikes in particle pollution, the highest number in 14 years.

"Something in the Air: Bridging the Air Quality Data Gap with Satellite Technology” calls for various actions from EPA, states and individuals, including:

• EPA and states must fully implement the updated annual PM2.5 standard.
• Because health-protective air quality standards are the basis for both cleanup and for communities’ understanding of local air quality, EPA must also set stronger science-based standards for all major air pollutants, including ozone and NO2.
• States should explore the use of satellite technology to supplement monitoring and modeling when developing State Implementation Plans for PM2.5 that ensure clean-up plans maximize benefits for health, particularly in environmental justice communities.
• States should embrace the opportunity to integrate supplemental data sources into non-regulatory air quality advisory and alert systems for public health protection.
• Individuals should use resources such as the EPA’s AirNow website (airnow.gov) to stay current on air quality conditions in their area that might affect their health.
• Individuals can become advocates in support of local and national policies that aim to improve air quality and reduce pollution by joining the American Lung Association’s Lung Action Network.

Read the full report at Lung.org/something-in-the-air.