(Draft) 美國環保署(EPA, Environmental Protection Agency)同意煤灰運用於水泥與牆板

Ref:
http://blogs.courier-journal.com/watchdogearth/2014/02/10/epa-says-it-is-ok-to-use-coal-ash-in-concrete-and-wallboard/
http://blogs.courier-journal.com/watchdogearth/2014/01/31/epa-agrees-to-set-coal-ash-rules-this-year/