Ideal cycling speed is 8 to 9 miles per hour

Citylab featured UBC research that found exerting too much energy while walking or biking on city streets can increase the amount of airborne pollutants you inhale.

Alex Bigazzi, a civil engineering professor, found that cyclists should ride between 12kph and 20kph on city roads while pedestrians should keep between 2kph and 6kph.

“It appears that pedestrians and bicyclists choose travel speeds that approximately minimize pollution inhalation dose, although pollution is unlikely a primary motivation,” Bigazzi said.

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