11.   However, business won a major concession when regulators agreed to set aside for now a portion of the plan concerning nitrogen oxide emissions from the transportation sector.

12.   If palladium becomes too expensive, there may be a switch to platinum, which limits nitrogen oxide emissions more efficiently.

13.   In a separate decision, it blocked the EPA from requiring the states to order a new round of reductions in nitrogen oxide emissions from sources within their borders.

14.   Owners of some of the plants are already in court to block tighter limits on nitrogen oxide emissions that the EPA proposed last spring.

15.   The move was hailed by environmental groups, which have long pressed federal officials to take action to limit nitrogen oxide emissions that drift from state to state.

16.   They would be the cleanest generators in use in the city in terms of nitrogen oxide emissions, which cause smog and other pollution, the authority said.

17.   Xonon is designed to remove nitrogen oxide emissions from natural gas turbines by lowering the temperature.

18.   It also said that Peugeot has asked Toyota to provide it with proprietary catalytic converter technology that can reduce nitrogen oxide emissions.

19.   Nitrogen oxide emissions contribute to ozone production and climate change, as well as to air pollution around airports.