Bicycles have much lower mass _and_ lower speed and thus likely far lower emission. To put it into the words of the WHO: > More than 15 years have passed sinc

Bicycles have much lower mass _and_ lower speed and thus likely far lower emission. To put it into the words of the WHO: > More than 15 years have passed since the publication of Global update 2005. In that time there has been a marked increase in evidence on the adverse health effects of air pollution, built on advances in air pollution measurement and exposure assessment and an expanded global database of air pollution measurements (discussed in Chapter 1. New epidemiological studies have documented the adverse health effects of exposure to high levels of air pollution in low- and middle-income countries, and studies in high-income countries with relatively clean air have reported adverse effects at much lower levels than had previously been studied. https://www.who.int/publications/i/item/9789240034228 https://www.who.int/publications/i/item/9789240034228