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Stephen Johnson, Administrator, U.S. Environmental Protection Agency

Re: EPA Action to Control Hazardous Air Pollutants

Dear Administrator Johnson:

I have just been reviewing data on hazardous air pollutants in my local 
air, as shown on Environmental Defense's Scorecard website (scorecard.org), 
and the health risks posed by diesel emissions are shocking.  Based on data 
from your own national-scale air toxics assessment (NATA), diesel emissions 
by themselves are responsible for over 75% of the cancer risk in outdoor 
air attributable to hazardous air pollutants as a whole.

In other words, tighter controls on diesel alone would bring major benefits 
in reducing the health risks from hazardous air pollutants. This #1 air 
toxics problem deserves immediate and aggressive action.

I strongly urge you to support and implement the controls recommended by 
the state and territorial air pollution program administrators (STAPPA) and 
the association of local air pollution control officials (ALAPCO), 
including 

 * securing the more stringent standards for on-road, heavy-duty diesel 
engines you have now tentatively accepted, based on current advanced 
technology, for implementation in the 2007 model year; specifically, 
nitrogen oxide (NOx) standards no less stringent than 0.2 grams per brake- 
horsepower (g/bhp-hr), particulate matter (PM) emissions standards no less 
stringent than 0.01 g/bhp-hr, and a limit on the sulfur level in diesel 
highway fuel of 15 parts per million (ppm) or less;

 * adopting equivalently stringent emissions standards for non-road 
heavy-duty diesel engines, to be implemented in the same time frame, along 
with the ultra-low sulfur non-road diesel fuel that will be necessary to 
achieve these limits; and

 * effective steps to guarantee that all heavy-duty diesel engines, both 
on-road and non-road, operate in practice as cleanly as they are supposed 
to in design.

I also urge you to expand your diesel retrofit program dramatically, to 
speed up the cleanup of existing, high-polluting diesel engines.

Sincerely,
-- your name and address will appear here --