policy briefFalling Ridership Trends in Southern CaliforniaPublication DateJanuary 31, 2018Associated Project Can Smog Repairs Create Social Justice? The Tune In & Tune Up Smog Repair Program in the San Joaquin ValleyAreas of Expertise Public Transit, Shared Mobility, & Active Transportation View policy briefRelated Publications research report Estimating Health Benefits, Cost-Effectiveness and Distributional Equity from California's Vehicle Emission Reduction Initiatives: Lessons from the San Joaquin Valley's Tune-In & Tune-Up Program policy brief Can Smog Repairs Create Social Justice? The Tune In & Tune Up Smog Repair Program in the San Joaquin Valley research report Falling Transit Ridership: California and Southern California