Air Pollution

Power plants that burn fossil fuels, such as coal and oil, are major sources of sulfur dioxide (SO2) air pollution, releasing SO2 into the atmosphere during the combustion process.

Refrigeration and air conditioning systems often use HFCs as refrigerants, which can contribute to greenhouse gas emissions when released into the atmosphere.

Electrical equipment manufacturing, particularly the production of high-voltage switchgear and circuit breakers, is a major source of sulfur hexafluoride emissions.

Diesel engine operation, particularly in vehicles and machinery, is a major source of black carbon emissions, which contribute to climate change and air pollution.

Refrigeration and air conditioning systems often used CFCs as refrigerants in the past, contributing to ozone depletion and greenhouse gas emissions.

The United States Environmental Protection Agency (EPA) has set a national ambient air quality standard (NAAQS) for lead (Pb) of 0.15 micrograms per cubic meter (µg/m³), averaged over a rolling three-month period.

Vehicular emissions are the primary source of air pollution in urban areas, contributing to high levels of particulate matter, nitrogen oxides, and carbon monoxide.

Sulfur dioxide is primarily responsible for acid rain, as it reacts with water in the atmosphere to form sulfuric acid.

Particulate matter, especially fine particles (PM2.5), is primarily responsible for respiratory problems such as asthma and bronchitis, as it can penetrate deep into the lungs.

Construction activities involve a combination of sources that contribute to air pollution, including exhaust emissions from heavy machinery, dust generated from demolition and excavation, and chemical emissions from paints and solvents used in finishing works.

Construction activities, particularly those involving excavation and demolition, generate significant amounts of particulate matter, which includes dust, smoke, and other small particles that can be harmful to human health when inhaled.

To effectively control dust emissions, construction sites often employ a combination of measures, including water spraying to suppress dust, wind screens to redirect airflow, and dust collectors to capture and filter particulate matter.

Methane (CH4) is not typically emitted by construction equipment as a primary air pollutant. It is primarily associated with natural gas production and distribution, agriculture, and landfills.

Sulfur dioxide (SO2) is not typically emitted by paints and solvents used in construction. It is primarily associated with the burning of fossil fuels, particularly in power plants and industrial processes.

Ozone (O3) is not typically emitted directly by diesel-powered construction equipment. It is a secondary pollutant formed in the atmosphere through chemical reactions involving other pollutants, such as nitrogen oxides and volatile organic compounds.