The phrase "hazardous levels" means that something has reached a level that is dangerous or risky. It implies there is a potential threat or harm involved. Full definition
They soon realize many homes come with a catch: one home is sinking into the ground, another has hazardous levels of radiation and the last is dangerously close to an airport runway. (remonline.com)
While Indigenous people are less likely to drink alcohol, those who do are far more likely to consume at hazardous levels. (humanrights.gov.au)
Use all your ability to survive hazardous levels and fight epic boss battles. (apppcdownload.com)