The report suggests that even tougher restrictions on nitrogen emissions from upwind power plants may be needed to stem to trend.

The coal spends longer in the boiler and burns at a lower temperature, which reduces nitrogen emissions.

Although sulfur deposition has declined, nitrogen emissions have not changed substantially region-wide.

In early 2006 the city agreed to lower nitrogen emissions and was given until 2017 to meet its reduction goals.

Increasing nitrogen emission is a problem facing the delicate balance within the ecosystems that contain the Bay checkerspot in many areas.

It is a regionwide problem, and it is only going to get worse because of the projected growth of nitrogen emissions.

Two million tons of oxides of nitrogen emissions would be eliminated in the same decade.

Only a successful 'centring' will trigger a liquid nitrogen emission from the appropriate pod which signifies a contender score.

These aims involved the reduction of nitrogen emissions and noise levels and the improvement of road safety.

Huge reductions in nitrogen emissions can then be achieved.