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This post was originally published on Legal Planet. Reprinted with permission.

The environmental justice movement began with a focus on neighborhood struggles against toxic waste facilities and other local pollution sources. That focus now includes other measures to ensure that vulnerable communities get the benefit of climate regulations. The most powerful tool for assisting those communities, however, may be the National Ambient Air Quality Standards (NAAQS). The NAAQS (pronounced "knacks") are supposed to be the maximum amount of air pollution consistent with protection of public health and welfare.

Air pollution is the biggest threat to low-income communities and communities of color. As the American Lung Association has said:

Those unequal pollution levels translate into more deaths, more asthma attacks, and more hospitalizations.

Once the U.S. Environmental Protection Agency (EPA) sets the NAAQS, states have a limited time to issue new State Implementation Plans (SIPs) to achieve the standards. The process can be slow, but the advantage is that it casts a wide net. The SIPs cover all sources of pollution — everything from smoky diesel trucks to coal-fired power plants to use of ozone-causing chemicals. Even if the sources aren't located in the communities in question, the state still needs to address them if they cause violations of the NAAQS in those neighborhoods.

Air pollution is a serious health burden on people who already have many disadvantages in terms of health and life expectancy. Substantially tightening air quality standards isn't the only way to address that, but it's the most systematic. It's not only good in terms of American public health writ large, but as an environmental justice measure.