State Air Agencies Seek Changes To EPA Heavy-Duty NOx Options

The National Association of Clean Air Agencies (NACAA), which represents state air directors, is urging EPA to require even greater reductions of nitrogen oxides (NOx) from the heavy-duty truck fleet, submitting comments to the agency that show the group thinks “neither of the EPA’s proposed options are perfect,” NACAA Executive Director Miles Keogh tells Inside EPA . Option 1 would reduce NOx in two phases, with the first at 0.035 grams per brake horsepower hour (g/bhp-hr) out to 600,000 miles...