Currently, some oil and gas operations can avoid being classified as a "major source" of air pollution – which triggers more stringent controls – by claiming that individual wells or pieces of equipment are separate sources, even if they're close together and part of the same company's operation. This bill aims to close that specific "loophole," meaning emissions would be counted together. If passed, this change could lead to more oil and gas facilities needing to install advanced pollution controls, ultimately reducing overall air pollution in areas with high oil and gas activity.

Furthermore, adding hydrogen sulfide (H2S) to the list of hazardous air pollutants is significant because H2S is a highly toxic gas that, even at low levels, can cause health issues and has a strong rotten egg smell. By officially listing it, the EPA would be required to develop specific rules to control its release, particularly from oil and gas wells where it's a common byproduct. This means if the bill becomes law, the public would likely see enhanced protection from this specific dangerous pollutant, potentially improving health and quality of life for people living near these industrial sites.