Over 50 million Americans lack access to federal air quality data, study reveals
By Shannon Kelleher
More than half of US counties lack a single federally monitored station for keeping tabs on air quality, meaning more than 50 million Americans (about 15% of the population) live in “air quality monitoring deserts” that lack crucial data for protecting people from harmful pollutants, according to new research.
The findings come as environmental and public health advocates grow increasingly concerned about how recent Trump administration actions will impact air quality and the availability of data and resources for monitoring it.
The study, published April 21 in the journal Proceedings of the National Academy of Sciences, used September 2024 data from a US Environmental Protection Agency (EPA) directory to pinpoint gaps in air quality monitoring, finding that rural counties and those more heavily populated by minorities were less likely to have monitoring stations.
Air quality monitoring deserts, meaning those without a single monitoring station in the EPA’s database, are “highly concentrated” in the Midwest and the South, the study found. In states with higher populations and more urban areas, including California and Massachusetts, less than 20% of counties lacked monitoring stations, while in more rural states, including Arkansas and South Dakota, about 80% of counties or more lacked monitoring.
In some cases, state and local governments conduct their own air quality monitoring in the absence of federal coverage, which may not necessarily collaborate with the EPA’s monitoring program, according to the study.
“Current gaps in air quality monitoring in the United States have profound implications for communities, research, policy, and climate action,” the authors write. “Based on our findings, there is a need to reevaluate current air quality monitoring strategies and infrastructure.”