The history of benzene in gasoline dates back to the early days of fuel production, when makers sought a fuel that minimized knock. Leaded gasoline was widely used until the Clean Air Act banned it in 1970, but its use was later phased out due to health concerns.
As lead additives were phased out, fuel producers turned to benzene-based additives to increase octane levels and reduce knock. However, benzene is a known carcinogen, and exposure can have serious short-term and long-term side effects.
In 2007, the EPA introduced rules limiting the concentration of benzene in fuels, requiring refiners to meet an annual average standard of 0.62 vol% for all gasoline, both reformulated and conventional.
The new rule also introduced a credit trading program, allowing refineries to earn credits by complying with the regulations and sell them to other companies.
This policy change has led to significant reductions in benzene concentrations in the air, with one study finding that ambient benzene levels had dropped by nearly 50% since its introduction.
The EPA's move to limit benzene in gasoline reflects growing concern over air pollution and its health impacts. By reducing exposure to this known carcinogen, the agency aims to improve public health and protect the environment.
While the EPA's rules have been instrumental in reducing benzene concentrations, other factors like ethanol production and electric vehicle adoption are also driving changes in the fuel industry.
As the U.S. transitions towards cleaner energy sources, the impact of regulations like the EPA's benzene limits will continue to shape the nation's transportation landscape.
The long-term effects of these policy changes remain to be seen, but one thing is clear: reducing exposure to benzene has the potential to improve public health and protect the environment.
The EPA's move to limit benzene in gasoline reflects growing concern over air pollution and its health impacts.
