> she'll cycle along roads because "exercise offsets it." Ideally, we'd cycle on paths away from busy roads to reduce exposure to pollution. But that option is

> she'll cycle along roads because "exercise offsets it." Ideally, we'd cycle on paths away from busy roads to reduce exposure to pollution. But that option isn't available for all cities and all commutes. But the point is that if you're going to be exposed to pollution anyway, you might as well get some exercise.