Editing Sulfur dioxide (section)

===Inhalation===
Incidental exposure to sulfur dioxide is routine, e.g. the smoke from matches, coal, and sulfur-containing fuels like [[bunker fuel]]. Relative to other chemicals, it is only mildly toxic and requires high concentrations to be actively hazardous.<ref>[https://www.epa.gov/so2-pollution/ Sulfur Dioxide Basics] U.S. Environmental Protection Agency</ref> However, its ubiquity makes it a major air pollutant with significant impacts on human health.<ref name="EPA">[https://www.epa.gov/so2-pollution Sulfur Dioxide (SO2) Pollution]. [[United States Environmental Protection Agency]]</ref>

In 2008, the [[American Conference of Governmental Industrial Hygienists]] reduced the [[short-term exposure limit]] to 0.25 parts per million (ppm). In the US, the [[Occupational Safety and Health Administration|OSHA]] set the [[Permissible exposure limit|PEL]] at 5 ppm (13&nbsp;mg/m<sup>3</sup>) time-weighted average. Also in the US, [[NIOSH]] set the [[IDLH]] at 100 ppm.<ref name=NIOSH>{{cite web |url=https://www.cdc.gov/niosh/npg/npgd0575.html |title=NIOSH Pocket Guide to Chemical Hazards }}</ref>  In 2010, the [[EPA]] "revised the primary SO<sub>2</sub> [[NAAQS]] by establishing a new one-hour standard at a level of 75 [[parts per billion|parts per billion (ppb)]]. EPA revoked the two existing primary standards because they would not provide additional public health protection given a one-hour standard at 75 ppb."<ref name="EPA" />