Delaware must now inspect cars for smog in Philadelphia's air quality zone

US environmental regulators are approving Delaware's plan to start inspecting vehicle emissions in New Castle County. This means cars in that area will need to pass smog checks to meet federal clean air standards.

For years, some areas have struggled to meet federal clean air standards, often due to vehicle emissions. This approval means Delaware is now legally required to implement a specific program to reduce that pollution. It shifts the burden of proof onto car owners and inspection stations to ensure compliance.