![OSHA silica 5707faf3a1528](https://img.forconstructionpros.com/files/base/acbm/fcp/image/2016/04/OSHA_silica.5707faf3a1528.png?auto=format%2Ccompress&fit=crop&h=288&q=70&w=512)
New OSHA rule slashes permissible exposure limits for silica dust by 80%.
AGC claims the new targets are unattainable given current air filtration technologies.
AFL-CIO, other labor groups are celebrating, citing 75-year-old battle to combat silicosis.
AGC, ABC, ARTBA, ASA, MCAA, NAHB among groups mount joint legal challenge.
(more on construction-industry reaction to new OSHA silicosis rule . . . )