Air Quality Standards for Sulfur Dioxide (SO2)

Sulfur dioxide is a known irritant that can cause inflammation and constriction of the airways, leading to difficulty breathing and other respiratory symptoms, particularly in individuals with asthma or other respiratory conditions.

Natural gas is a relatively clean-burning fuel that does not produce significant amounts of sulfur dioxide when burned. The primary sources of sulfur dioxide emissions are power plants and industrial facilities that burn fossil fuels containing sulfur.

The NAAQS for sulfur dioxide is set at 75 ppb, averaged over a one-hour period. This standard is designed to protect public health by limiting exposure to harmful levels of sulfur dioxide in the air.

Sulfur dioxide emissions from power plants and industrial facilities can react with water vapor in the atmosphere to form sulfuric acid, which is a major component of acid rain. Acid rain can damage forests, lakes, and other ecosystems, and can also contribute to human health problems.

Reducing sulfur dioxide emissions requires a multi-faceted approach that includes using cleaner-burning fuels, installing pollution control devices on power plants and industrial facilities, and promoting energy efficiency and conservation measures. These strategies can help to improve air quality and reduce the associated health and environmental impacts of sulfur dioxide pollution.