A systematic review of quantitative assessments of traffic-focused urban air quality regulations

This systematic review follows PRISMA 2020 guidelines to identify whether measurable impacts have been observed following urban air quality interventions targeting private road users. A structured search was conducted on Scopus in February 2025, identifying 2088 studies. After applying strict inclusion criteria - requiring studies to examine urban-scale air quality interventions, target private road users, and apply quantitative ex post causal inference techniques - 59 studies were included for