The Paris Agreement, adopted in 2015, is a landmark international treaty that aims to limit global warming and address climate change. It includes measures to reduce air pollution and promote clean energy.

The Clean Air Act, enacted in 1970, is the primary federal law in the United States that regulates air pollution. It sets limits on emissions from various sources, including vehicles, power plants, and industrial facilities.

Air scrubbing is a process that removes pollutants from the air by passing it through a medium that traps or absorbs the pollutants. This can be done using various technologies, such as wet scrubbers, dry scrubbers, and electrostatic precipitators.

Sulfur dioxide is a major contributor to acid rain, which is formed when sulfur dioxide and nitrogen oxides react with water vapor in the atmosphere. Acid rain can damage forests, lakes, and buildings.

Long-range transport of air pollution refers to the movement of air pollutants over long distances, often across national or international boundaries. This can result in air pollution problems in areas far from the original source of the pollutants.

The United Nations Environment Programme (UNEP) is the leading global environmental authority that coordinates efforts to address environmental issues, including air pollution. It works with governments, businesses, and civil society to promote sustainable development and protect the environment.

Emission standards are limits on the amount of pollutants that can be emitted into the air from a particular source. These standards are typically set by government agencies to protect public health and the environment.

Ground-level ozone is a major component of smog, which is a type of air pollution that can cause respiratory problems and other health issues. Ozone is formed when sunlight reacts with nitrogen oxides and volatile organic compounds (VOCs) in the air.

Pollution prevention refers to the practice of reducing air pollution by using cleaner technologies and processes that generate fewer pollutants. This can involve using more efficient equipment, switching to cleaner fuels, or implementing better waste management practices.

Carbon dioxide is the primary greenhouse gas responsible for the greenhouse effect, which traps heat in the atmosphere and contributes to global warming. Carbon dioxide is released into the air through human activities such as burning fossil fuels.

Air quality assessment involves measuring and evaluating the levels of air pollutants in the atmosphere to determine their impact on human health and the environment. This can be done through monitoring stations, modeling, and other techniques.

Particulate matter, especially fine particulate matter (PM2.5), is a major contributor to respiratory problems, such as asthma and bronchitis. PM2.5 consists of small particles that can penetrate deep into the lungs and cause inflammation and other health issues.

Air pollution enforcement refers to the actions taken by government agencies to ensure compliance with air pollution laws and regulations. This can involve inspections, investigations, and legal actions against violators.

Sulfur dioxide is a major contributor to acidification of lakes and streams. When sulfur dioxide reacts with water vapor in the atmosphere, it forms sulfuric acid, which can be deposited on the ground through rain or snow, leading to acidification of water bodies.

Renewable energy transition refers to the shift from fossil fuels to renewable energy sources, such as solar, wind, and hydropower, to generate electricity and power various sectors of the economy. This transition is seen as a key strategy to reduce air pollution and combat climate change.