Eric Jaffe at CityLab discusses my post from Monday:

The ever-thought-provoking David Levinson posed a question at his Transportationist blog earlier this week that’s worth a longer look: Are you more likely to die from being in a car crash or from breathing in car emissions? If your gut reaction is like mine, then you’ve already answered in favor of crashes. But when you really crunch the numbers, the question not only becomes tougher to answer, it raises important new questions of its own. …