"Coal Trains and their emissions, and coal burned overseas will negate some of the gains we have made in clean air as it relates to longer and healthier lives.
Dr. Robert Truckner, a Spokane Physician and former EPA clean air official
says diesel PM is .05 microns. Coal dust is 3 microns. I looked it up and a
micron is a millionth of a meter or .00004 inches. Just for some comparisons:
The average sized US Postal Stamp has 25,400 microns in it. Human has has 40-300
microns in one strand."
December 3, 2012 online edition of the journal Epidemiology.
"Despite the fact that the U.S. population as a whole is exposed to much
lower levels of air pollution than 30 years ago -- because of great strides made
to reduce people's exposure -- it appears that further reductions in air
pollution levels would continue to benefit public health," said lead author
Andrew Correia, a PhD candidate in the Department of Biostatistics at HSPH."
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