For more than a decade, the United States dramatically reduced its national smog levels, but since 2015, smoke from ...

Chicago and most of its suburbs are under an air quality alert as unhealthy ozone levels grip the region from Tuesday into at ...

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

As a child growing up in Southern California, Ann Carlson remembers mountains obscured by haze and yellowish brown air that stung her eyes and made her lungs ache. It was just “the environment,” her ...

Stricter OBD rules: In 2026, all applicable OBD-II readiness monitors must be set for a vehicle to pass, ending long-standing exemptions. Impact on drivers: More vehicles may initially fail smog ...

The Trump administration says the cities shouldn’t be penalized for unhealthy air because pollution can blow in from abroad. Some experts say that’s preposterous. By Hiroko Tabuchi For decades, ...

Cars on the road today are 99% cleaner than they were in 1970. Air quality in the United States is much, much better as a result. In Los Angeles, where I live, lead levels in the air were 50 times ...

Before catalytic converters, starting a gas-powered vehicle could choke the surrounding area with smog. Bettmann via Getty Images Cars on the road today are 99% cleaner than they were in 1970. Air ...

SAN ANTONIO – An estimated 2 million vehicle owners in Bexar County could face new costs starting this November. November is when a new state law will require some vehicles to pass an emissions test ...

Eighty years ago, the enchantment ended. Los Angeles, that magical realm of shimmering natural beauty, was befouled by smog — maybe forever. The mayor, Fletcher Bowron, told Angelenos in 1944 to lower ...

LAS VEGAS (FOX5) — Clark County is offering financial assistance to drivers whose vehicles fail smog tests through its Smog Free Clark County program. The program hosted a repair event where drivers ...

Kraków’s ban on burning solid fuels plus subsidies for cleaner heating has led to clearer air and better health As a child, Marcel Mazur had to hold his breath in parts of Kraków thick with “so much ...