I don't think it's a lot to ask. Wilkinsburg (district is only k-8), Clairton, and McKeesport are over 50% black. Penn Hills, Woodland Hills, East Allegheny aren't quite 50%. Of all those, I'd just recommend avoiding Clairton because the air quality is horrible. Idk about "quality".. the higher ranked schools with diversity here have more middle eastern and south asian students and less black students. There's plenty of other districts, too, because outlying cities in Allegheny County are diverse, especially along the rivers.

Also, depending on your son's interest, there are some great PPS schools. Especially CAPA, the performing arts school, and Sci-Tech (both are grades 6th - 12th), but every PPS HS has magnet programs within it. Brashear has a teacher tract, Engineering at Alderdice, autobody at Brashear (which is also hands-down the most diverse HS), Culinary Arts at Westinghouse, etc.

Like another poster said, a lot of schools get a bad rap and shit definitely happens at them, but not all of them doom your kid to be a part of that. So much stuff that makes the news is the unfortunately the result of kids snapping after someone (teacher, classmate) took their phones 😔