It's interesting if you look at the map of NO2 in China, it is highest in Hubei. Likewise if you look at Europe, no place has nearly the level of N02 as Northern Italy. If you look at the US, it's by far highest in New York City.
Indeed, it will be very interesting to see how this plays out over time, but there does seem to be a consistent correlation. This might enable us to target responses and resources more effectively.