1,300 Drive-Throughs, Zero Tracking: The Valley's Uncounted Idling Problem

The San Joaquin Valley is home to roughly 1,300 fast-food and coffee drive-through lanes, and every one of them invites drivers to sit with their engines running. That idling releases carbon dioxide, carbon monoxide, hydrocarbons, and nitrogen oxides. A 2016 study measured about 0.75 grams of CO2 per second from a single idling vehicle in a drive-through line. String enough of those seconds together across 1,300 lanes and the total starts to matter, especially in a region that already fails federal air quality standards for ozone and PM 2.5.

Researchers are careful to note that drive-through emissions are small compared to overall driving. The difference is concentration. Those pollutants don’t disperse into open highway air; they settle right where people are, including drivers in line, workers at the service window, and diners inside. And here’s the gap: CARB does not specifically track drive-through emissions, which means the state has no real baseline for managing them. As one researcher put it, if you can’t measure the problem, you can’t manage it.

Some California cities have responded by restricting new drive-throughs, while industry groups argue they’re essential to doing business. Valley zero-emission vehicle adoption sits just over 3%, below the 7.5% state average, so cleaner engines won’t fix this quickly on their own. That leaves a local question with no easy answer: how much convenience are we willing to trade for cleaner air? What do you think, should cities limit new drive-throughs?