30-35% purity is low. Here in Detroit the average heroin has at least a 60% purity and it is common to get dope that's 70-80% in purity. I've read that in New Jersey and Baltimore you can get purity levels up to 98% (
Source: US Justice Department).
i read the article... and yes, in a few very big cities, H purity is around 65%, but according to opioids.com the USA average is 35% purity... which is way higher than the average here (Paris) i read according to the..."French observatory of drugs and drug users" iis an average of 7.1%, so if you're used to that, and you slam 35% purity stuff you're gonna have quite a shock if you live, allthough if you're willing to drive a few hours to Rotterdan, you can get higher purity for a tenth of the price