Landfills are dangerous to humans and so it is advisable that no one shall stay near to it. Emission of harmful gas could be very high around the perimeter of a sanitary landfill. But, why is it that there are still people doing their own business around the sanitary landfills? Scavengers – people who collects things that has been discarded by others. Their often seen inside the dumpsites and surely they’ve been exposed to these harmful gases a lot.