Depending on where you live in the United States, emissions testing of old cars may or may not even be a thing. There are 28 ...

Across the United States, the rules for checking tailpipe pollution are quietly shifting, even as climate targets grow more ...

In March 2022, within a broader-treatment post on automobile owners’ rights to repair their own vehicles, I briefly introduced the topic of the on-board diagnostics (OBD) port, used to monitor (and in ...