Iowa City's fare-free bus program is claimed to reduce traffic and improve air quality, but the snippet provides no quantitative data.
CSRIO marks 50 years of Cape Grim baseline air monitoring, highlighting long-running data on greenhouse gases and pollutants with links to international climate regulation and reporting.
NYC’s congestion pricing reduced PM2.5 by 22% in six months, with notable intra-city and metro-area air-quality improvements and substantial traffic reductions in the toll zone.