Harris County gets failing grade for dangerous particle pollution levels
Harris County again failed on year-round particle pollution, with Ship Channel neighborhoods facing the heaviest exposure and health risks that can ripple into work and school.
Along the Houston Ship Channel, where more than 618 chemical manufacturing facilities sit on the industrial fenceline, Harris County once again got a failing grade for dangerous year-round particle pollution. For families in the neighborhoods closest to those corridors, the result is more than a letter grade. It is the kind of air that can worsen asthma, strain hearts and lungs, and add another burden to the daily cost of living near heavy industry.
The American Lung Association’s 2025 State of the Air report, released April 23 and based on U.S. Environmental Protection Agency quality-assured air data from 2021 through 2023, said Harris County failed the standard for year-round particle pollution. The county also recorded 34.8 unhealthy ozone days per year and received an F for ozone, while short-term particle pollution earned a C with 1.3 unhealthy days per year. The Houston-Pasadena metropolitan area ranked seventh worst in the nation for ozone pollution.
Particle pollution is especially dangerous because it can seep deep into the lungs and bloodstream. The American Lung Association said it can contribute to premature death, asthma attacks, heart attacks, strokes, preterm births, impaired cognitive functioning later in life and lung cancer. Harris County Public Health says poor air quality can trigger asthma, heart attacks and stroke, and that children, older adults and people with heart and lung disease are especially vulnerable.
Environmental justice advocates in Houston have long argued that the burden falls hardest on communities living closest to industry. Fenceline Watch, a Houston-based group focused on ending toxic, multi-generational harm on communities living along the fenceline of industry, has repeatedly pointed to the Ship Channel as a hotspot for pollution exposure. In that context, a failing grade is not abstract. It reflects the air that workers, children and older adults breathe near refineries, chemical plants and freight corridors, where pollution can turn into doctor visits, missed work and missed class.
The statewide picture was mixed. The American Lung Association said year-round particle pollution reached its lowest average severity in the history of the report, yet 76 million people still live in U.S. counties with failing grades for that pollutant. Across all pollution categories, 156 million Americans, or 46% of the country, live in areas with failing grades for unhealthy ozone or particle pollution. Extreme heat and wildfires worsened air quality for millions, but Harris County’s numbers show that local industrial pollution remains a daily threat.
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