asbestos removal concept - hazard management with old roof and placard

removing asbestos roof removal hazard management abatement asbestosis fibers amiantus asbestic aged asbestine old waveshaped surface level cancer pollution testing rooftop asbestoscement construction material illness danger poisonous building activity mesothelioma fiber tumor carcinogen lung risk dust amiante panels air industry exposure environmental damage cancerous carcinogenicity dangerous toxic substance inhalation cement roofing concept placard placard