The Clean Air Act requires the U.S. Environmental Protection Agency (EPA) to set health-based limits, called National Ambient Air Quality Standards (NAAQS), for six dangerous outdoor air pollutants: ozone, particulate matter, nitrogen oxides, sulfur dioxide, carbon monoxide, and lead. The NAAQS identify what is considered a safe level of the pollutants to breathe, based on the most recent health and medical science. The standards alert the public when pollution levels place Americans’ health at risk, and require Tribes, states and local governments to take steps to reduce emissions to attain the standards. The standards are also used to inform families with children, seniors, people with lung or heart disease and others when air pollution levels are dangerous through color-coded air quality alerts, so they can take steps to limit their exposure. Under the Clean Air Act, the standard must be based solely on what is needed to protect health. “State of the Air” looks at the two most widespread and dangerous pollutants ozone and fine particulate matter.
Setting national health-based standards and requiring states that violate the standards to enact plans to clean up their air pollution problems has been a great benefit to the public health of the nation. Since the Clean Air Act was passed in 1970, emissions of criteria pollutants, including ozone and particle pollution, have fallen by 77%, according to the EPA. But as “State of the Air” 2021 shows, millions of Americans are still breathing unhealthy air.
In the year 2000, the American Lung Association launched its annual “State of the Air” to provide the public with easy-to-understand information about the quality of the air in their local communities based on the credible data and sound science that EPA is required to use to set the air quality standards.
For the first several years, “State of the Air” focused solely on ozone pollution and included data for 5 populations at increased risk – children, older adults, children with asthma, adults with asthma and people with emphysema. In 2004, changes to the air quality standards and the deployment of air pollution monitoring enabled the addition of short-term and year-round particle pollution to the report. Over time, accumulating scientific evidence has shown significant health harms from both ozone and particle pollution among other groups of vulnerable individuals. “State of the Air” has accommodated this new information by gradually adding populations-at-risk categories to its reporting. “State of the Air” 2021 now includes data for 10 vulnerable groups.
Since its inception, “State of the Air” has been tremendously successful in raising awareness about ozone and particle pollution, the two most dangerous and pervasive air pollutants nationwide. The American Lung Association is proud and grateful that the public, the media, clean air advocates and decision-makers have used this report every day, year after year, to call attention to the work that remains to be done to protect the health of all Americans from the threat of air pollution.
We write and release “State of the Air” every year to make information on air quality and health clear and accessible to everyone. We show the progress each community has made and how much more needs to be done to achieve healthy air. In this report, you’ll find information on local air quality nationwide. You’ll also find the latest roundup of the research on how air pollution affects health. With these tools, you can help keep your lungs and your family’s lungs safer from unhealthy air.
This report also includes ideas for how you can become a champion for clean air. First, we have suggestions for concrete actions you can take to reduce your own contributions to air pollution and climate change. And second, we invite you to take advocacy action with the American Lung Association. Your voice is powerful, and when you tell your leaders that your lungs depend on stronger limits on air pollution, you make a compelling case. Please share your story and add your name to our petition – and then, take the next step. Reach out to your representatives at every level of government, share the “State of the Air” results for your community, and call on them to take action to protect public health.
Page last updated: April 15, 2021