to what sort of hazardous areas are you referring or hoping to identify with this chart. these charts, known as 'Sectionals', will show virtually all airfields, public and private, bodies of water, railroad tracks, cities and towns, nuclear power stations and just about anything a pilot flying under visual flight rules would need to be aware of for safety or navigation purposes. other than identifying airfield locations i'm not certain this will serve any useful purpose in identifying undesireable locations.
one thing. you'll notice that each airfield is identified by. 3-character alpha or alpha-numeric ID such as my home field, ARR. you can lookup these airfields to get an idea of what sort of air traffic they serve and how busy they are.
AirNav: Airport Information