I think the events in Wuhan, Bergamo, and New York City (and perhaps in Manaus, Brazil and New Delhi) are poorly understood, and that outdoor transmission UNDER THOSE CONDITIONS (extreme crowding, very high attack rates, and lots of sick people walking around) is not impossible.
Obviously, treating ten people at a girl's lacrosse game outdoors with a 10 mph steady wind, or you alone on your rail trail, is moronic.
But never say never.
I get that.
I am not saying in any way outdoor transmission is impossible, but it is a function of dosage, strength, and time.