Ubiquitous data-driven framework for traffic emission estimation and policy evaluation
Carlo Ratti
Nature Sustainability, Published online: 02 April 2026; doi:10.1038/s41893-026-01797-9 Urban traffic emission estimates are often too coarse or slow to evaluate decarbonization policies. A study now fuses data from traffic cameras and mobile phones to estimate citywide emissions in near-real time, finding strong spatiotemporal variation and a 16–22% emission drop after congestion pricing.