The theory is that in the SNCR, the urea that's injected into the exhaust to bind with the nitrogen oxides
and break them down also was attaching to a minute amount of sulfur in the exhaust to create another gas that potentially forms a tarry particulate after it left the emissions stack, Re said.
We were able to improve the fuel economy with a biodiesel blend while reducing nitrogen oxides
to where they were with conventional diesel," Shaver said.
The eco-cause of the day was acid rain in the Northeast, caused in part by utility emissions of sulfur dioxide and nitrogen oxides
, which increased acid deposition in particle form on the ground and raised the PH of rain and snow when mixed in the atmosphere.
Sulfur dioxide, nitrogen oxides
and metal dust spewed forth from the four-mile-long local steel plant were the culprits.
, itself a pollutant, controls the production of ozone, which in turn is a greenhouse gas and a pollutant at ground levels.
They also help counter one of the challenges of the diesel engine, which is that while the low emissions of nitrogen oxide
are part of the engine's profile, they arise in just the opposite way to soot particulates.
Utilities had to make massive, decades-long investments to install new pollution controls to simultaneously reduce sulfur dioxide, nitrogen oxide
, and mercury emissions.
Karn electric generating plant that will sharply reduce emissions of nitrogen oxides
Aviation-related emissions of nitrogen oxides
, which contribute to the formation of ozone, have been of particular concern to many airport operators.
To help cut emissions, the EPA implemented its first DPM standard for light-duty cars and trucks in 1982, and for heavy-duty vehicles in 1988, after setting individual standards in earlier years for nitrogen oxides
The principal objective of the system, called Diesel Particulate Nitrogen Oxide
Reduction (DPNR), is to reduce both nitrogen oxide
and particulate matter continually with a simple and compact catalytic converter system, Toyota said.
New York's governor will order cuts in nitrogen oxide
and sulfur dioxide emissions from coal burning power plants.