Spare The Air week is an event organized by Butte Regional Transit to encourage riding of the B-Line bus as a form of alternative transportation and to reduce air pollution.

As an incentive bus fares are free for the duration of the week. In 2008 guest speakers on specified routes offered insights into the history and geography of Chico, and passengers could enter into drawings for prizes.

Spare The Air week has been made possible by grants from the Butte County Air Quality Management District.