How does the built environment and traffic impact air pollution, and what does this mean for public health? 

April 23, 2026

Air pollution threatens public health globally. Our exposure to air pollution is influenced by transport. Transport is both a prominent source of air pollution and an important determinant in our exposure to it. The built and natural environment also dictate how, when and where we travel, and what we are exposed to. We provide a comprehensive review of these relationships and their interactions.

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Natural experiments in urban air quality in Rwanda

April 12, 2026

To understand the current drivers of air pollution, we used two natural experiments (Car-Free Day and COVID-19 Lockdown) to examine their impact on air pollution using particulate matter air pollution data in Kigali City. The health impact of non-motorized transport events in Kigali, known as ‘Car-Free Days,’ goes beyond just mass physical exercise. Importantly, it has reduced air pollution by 15%, this is expected to save more than 200 disability-adjusted life years annually.

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