https://www.latimes.com/archives/la-xpm-1989-06-09-mn-1651-story.html
Stringent New Smog Controls on Cars Ordered - Los Angeles Times
Jun 9, 1989 - In a major boost toward cleaning up the smoggy Los Angeles Basin, the state Air Resources Board on Thursday ordered stringent new tailpipe emission controls on...
smog controlslos angelesstringentnewcars
https://www.kpbs.org/news/national/2023/08/02/california-firm-to-pay-1-million-for-selling-devices-to-thwart-diesel-truck-smog-controls
California firm to pay $1 million for selling devices to thwart diesel truck smog controls | KPBS...
Aug 2, 2024 - A California company will pay $1 million for violating federal environmental laws by making and selling devices that defeated smog controls on diesel trucks.