Seems like covering it would stop the air pollution and I assume the resultant particulate pollution of waterways.  Same thing that would prevent cracked windshields from uncovered trucks with loads on the freeway.  Selling coal to Asia must mean China is holding onto all of theirs (?).  Anyway, its jobs here so we would seem to need to find a way to keep our environment clean at the same time, like we do to protect our waterways when we allow access to container ships.  Would be delightful to not use any coal or oil, nor fracking nor natural gas.  I don’t see that happening, so bottom line, no environmental laws in place to prevent coal dust blowoff?