The Asthma thing is interesting. Wonder if it is related to the shoddy housing they often live in. It is getting better as basic housing standards improve over time, and non-discrimination laws are allowing more blacks better economic opportunities, but a lot of the low end dilapidated housing many still live in can't be very airtight just looking at them.
Though it doesn't hold any water, one of the better arguments I have seen to some of these things is to blame it on inferior health care for negroes. Which in part could explain two or three things. If you wanted to buy into that argument. But it doesn't explain those things away to any meaningful degree. Also, all Americans pretty much get the same health care. Unless you go through the VA. Then it pretty much sucks for everybody. And for the poverty angle, consider this. There are around 196 million Whites in the U.S. There are about 42 million negroes. So there are probably more poor White people than there is the entirety of negroes in the U.S.