Parts of the country that fail to bring their pollution levels into compliance with National Ambient Air Quality Standards are called:

The term used for parts of the country that do not meet the National Ambient Air Quality Standards (NAAQS) is "non-attainment areas." This designation is significant because it indicates regions where air quality does not meet established federal standards for specific pollutants, such as ground-level ozone, particulate matter, and nitrogen dioxide, among others.

Non-attainment areas are important from both a regulatory and a public health perspective. The Environmental Protection Agency (EPA) works with states and local governments to develop plans and implement strategies to reduce pollution and improve air quality in these regions. Identifying non-attainment areas allows for targeted action to protect public health and the environment.

Understanding this concept also highlights the broader goals of the Clean Air Act, which aims to ensure that all Americans have access to clean air, a fundamental aspect of environmental health. By monitoring and addressing air quality in non-attainment areas, significant strides can be made in environmental health efforts.