California legislators might finally give classic cars owners a break on costly smog inspections, by passing a bill known as ...

California’s war with car culture may not be over, but enthusiasts just scored one of their biggest victories in years. More ...

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Research shows that high temperatures can worsen air pollution, increase ground-level ozone, trap harmful particles in the ...

Utah Republican Mike Lee and three colleagues argued that regional circuit courts should handle lawsuits over EPA’s rejection of state smog plans. Four Republican senators are urging the Supreme Court ...

A.J. Haagen-Smit, a Dutch-born chemist at Caltech, shows how smog is produced when hydrocarbons like rubber are oxidized or burned. In this 1950 demonstration the balloon exploded when ozone, an ...