"Sulphur oxide" refers to a type of gas that is formed when sulphur reacts with oxygen. It is known for causing air pollution and can contribute to the formation of acid rain, which can harm the environment and living organisms. Full definition
This will significantly reduce the amount of sulphur oxides emanating from ships and should have major health and environmental benefits. (imo.org)
Criteria air contaminants (CACs), which are the focus of this page, refer to a group of pollutants that include sulphur oxides (SOx), nitrogen oxides (NOx), particulate matter (PM), volatile organic compounds (VOC), carbon monoxide (CO) and ammonia (NH3). (pearltrees.com)
In the 1970s, AOERP had concerns about the impact of sulphur oxide emissions and the resulting acid rain on lakes in the tar sands area in northeastern Alberta. (thetyee.ca)