Reuters: The Obama administration will propose on Friday long-awaited rules to slash smog-forming emissions from gasoline that have been linked to lung and heart ailments, health groups and an environmental regulator source said on Thursday.
The Environmental Protection Agency will propose the so-called Tier 3 rules that will require refiners to reduce the sulfur content of gasoline to 10 parts per million by 2017 from the current standard of 30 ppm, an agency source said on condition of anonymity.
Reducing...