As another winter draws to a close, so does a familiar cycle: air pollution spikes, emergency measures follow, yet air quality barely improves. Meanwhile, residents remain exposed to toxic pollutants that harm public health. Instead of recurring short-term responses, what is needed is sustained structural reform. If clean air is the goal, transport must be placed at the center of air-quality policy.A decade of evidence from Delhi explains why. Transport is consistently a dominant source of toxic...