Vehicle emissions are the primary source of air pollution in urban areas, accounting for a significant portion of particulate matter, nitrogen oxides, and carbon monoxide.

Sulfur dioxide is the primary air pollutant responsible for acid rain. When released into the atmosphere, it reacts with water vapor to form sulfuric acid, which contributes to the acidity of rain and other forms of precipitation.

Carbon dioxide is the major greenhouse gas emitted by human activities, primarily through the burning of fossil fuels for electricity, heat, and transportation.

The Paris Agreement is an international agreement that aims to reduce greenhouse gas emissions and mitigate climate change. It was adopted by 196 countries at the 21st Conference of the Parties (COP21) to the United Nations Framework Convention on Climate Change (UNFCCC) in Paris, France, on 12 December 2015.

The primary goal of the Clean Air Act in the United States is to set national ambient air quality standards for certain pollutants, including particulate matter, ozone, carbon monoxide, nitrogen dioxide, sulfur dioxide, and lead.

Particulate matter, particularly fine particulate matter (PM2.5), is primarily associated with respiratory problems, such as asthma and bronchitis. These particles can penetrate deep into the lungs and cause inflammation and irritation.

Air pollution control refers to the process of removing pollutants from the air, typically through the use of various technologies and strategies. These technologies may include scrubbers, filters, catalytic converters, and electrostatic precipitators.

Ozone is the primary air pollutant responsible for the formation of smog. It is formed through a complex series of chemical reactions involving nitrogen oxides and volatile organic compounds (VOCs) in the presence of sunlight.

Emission reduction refers to the process of reducing the amount of pollutants released into the air. This can be achieved through various strategies, such as improving energy efficiency, using cleaner fuels, and implementing pollution control technologies.

The Montreal Protocol is an international agreement that aims to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

Air quality management refers to the process of improving the quality of the air. This involves monitoring air pollution levels, identifying sources of pollution, and implementing strategies to reduce emissions and improve air quality.

Sulfur dioxide is the primary air pollutant responsible for the formation of acid rain. When released into the atmosphere, it reacts with water vapor to form sulfuric acid, which contributes to the acidity of rain and other forms of precipitation.

Environmental remediation refers to the process of removing pollutants from contaminated soil or groundwater. This can be achieved through various technologies, such as bioremediation, phytoremediation, and soil vapor extraction.

Particulate matter, particularly fine particulate matter (PM2.5), is primarily associated with cardiovascular problems, such as heart attacks and strokes. These particles can enter the bloodstream and cause inflammation and damage to the heart and blood vessels.

Waste reduction refers to the process of reducing the amount of waste produced. This can be achieved through various strategies, such as reducing consumption, reusing products, and composting organic waste.