It definitely is difficult, thank you. It also seems to me to be of limited value unless you’re specifically trying to measure the effect of different policies.

It definitely is difficult, thank you. It also seems to me to be of limited value unless you’re specifically trying to measure the effect of different policies. Let’s just do what we can to improve air quality everywhere. We know diesel bans work, we know EVs work, we know congestion pricing works. Let’s just do it - especially for our kids. Doesn’t seem particularly controversial to me.