asbestos warning sign on building

actinolite amosite anthophylite asbestiform asbestos asbestosis beware blue breathed building caution chrysotile contaminated contamination crocidolite crystals danger dangerous external fibres fibrils fibro fibrolite fibrous green harmful hazard health made mesothelioma microscopic minerals naturally notice occurring outdoors outside poison poisonous red risk safety set sign signage silicate six toxic toxicity toxin tremolite warn warning when white yellow