The Clean Air Act is the comprehensive federal law that regulates air emissions from stationary and mobile sources.

The NAAQS establish maximum permissible levels for certain air pollutants in the ambient air to protect public health.

Primary air pollutants are emitted directly from sources, such as vehicles, industrial facilities, and power plants.

Emission reduction refers to the strategies and technologies employed to decrease the release of pollutants into the atmosphere.

The EPA is the federal agency tasked with implementing and enforcing environmental regulations, including those related to air pollution.

Emission trading allows polluters to trade emission allowances, enabling them to meet their regulatory obligations in a cost-effective manner.

Secondary air pollutants are formed in the atmosphere through chemical reactions between primary pollutants.

Air quality monitoring programs provide data on pollutant concentrations, which is essential for assessing air quality and developing control strategies.

Stationary sources are facilities that emit air pollutants from a fixed location, such as power plants, factories, and refineries.

Emission reduction strategies for mobile sources involve the use of cleaner fuels, more efficient engines, and advanced emission control technologies.

Mobile sources are vehicles that emit air pollutants while in motion, such as cars, trucks, buses, and airplanes.

Emission offset programs allow polluters to meet regulatory requirements by investing in projects that reduce emissions elsewhere.

Smog is a type of air pollution that is formed by the reaction of sunlight with certain pollutants, including ozone.

Emission control refers to the technologies and strategies employed to reduce emissions from new sources before they are released into the atmosphere.

Greenhouse gases are gases that trap heat in the atmosphere, contributing to climate change. Carbon dioxide is a significant greenhouse gas regulated under the Clean Air Act.