Clean on Paper, Dirty on the Road: troubles with California’s Smog Check

Clean on Paper, Dirty on the Road: troubles with California’s Smog Check

Smog check programmes have failed for several reasons: (1) Current programmes only encourage cars to be clean on the inspection day and do little to deter motorists from tampering; (2) Although most emissions come from a few vehicles with high emissions, current programmes require inspection of all cars; (3) About half the cars repaired following an inspection have increased emissions.

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