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Data from the City of London and a study by Queen Mary University of London indicate that expanding the low-emission zone helped reduce key pollutants and improve lung function among children. The findings show that charges imposed on polluting vehicles, along with the spread of electric cars and a scrappage scheme, changed travel patterns over a short period.
A network of 10 sensors belonging to NASA’s MAIA project provided continuous data on fine particulate matter and black carbon in Addis Ababa between 2022 and 2025. The findings showed that average PM2.5 rose to more than three times the U.S. Environmental Protection Agency standard, with clear variation associated with traffic, fuel burning, and celebrations.