Sentences with phrase «called oxides of nitrogen»

Results were strongest for fine particulate matter and the traffic - related pollutant gases called oxides of nitrogen.

Not exact matches

Catalysts have been an integral part of diesel - and gasoline - powered engines since the mid-1970s as federal regulations called for reductions of carbon monoxide, hydrocarbons and nitrogen oxides.

Among biogenic volatile organic molecules is a class of compounds called monoterpenes, which react with ozone, hydroxyl radicals, nitrogen oxides, and other gases in the atmosphere.

Like vehicles and power plants, trees emit airborne chemicals called volatile organic compounds (VOCs), which in the presence of sunlight react with nitrogen oxides in vehicle fumes to form ozone, one of the components in smog that makes it a health threat.

Why It Matters: Catalysts have been an integral part of the exhaust systems of diesel - and gasoline - powered engines since the mid-1970s when federal regulations called for reductions of carbon monoxide, hydrocarbons and nitrogen oxides.

Volkswagen Group's so - called «defeat - device» emissions software has allowed hundreds of thousands of diesel vehicles from the 2009 - 16 model years to emit nitrogen oxide at illegal levels while thwarting emissions tests.

Most of Volkswagen's diesel competitors opted for urea - injection, using an additive called AdBlue contained in a separate reservoir that helps to reduce nitrogen oxide emissions.

Acid rain: Also called acid precipitation or acid deposition, acid rain is precipitation containing harmful amounts of nitric and sulfuric acids formed primarily by sulfur dioxide and nitrogen oxides released into the atmosphere when fossil fuels are burned.

In order of reduction, they call for controlling nitrogen oxide emissions from the burning of fossil fuels using «maximum feasible reductions,» which could reduce reactive nitrogen emissions by 55 billion pounds of a year; increasing the efficiency of fertilizing crops (33 billion pounds a year); improved animal management policies (33 billion pounds); and ensuring that at least half the world's urban population has sewage treatment (11 billion pounds).

Nitrous oxide, a potent greenhouse gas also known as N2O, is released as a byproduct of the bacterial conversion of nitrogen in agricultural soils, the so - called nitrification and denitrification processes.

The burning of coal also produces sulfur and nitrogen oxides that react with atmospheric moisture to produce sulfuric and nitric acids — so - called acid rain.

The findings, presented at the American Geophysical Union in San Francisco, said that every night chemicals from vehicle exhaust and other human created sources are broken down and prevented from becoming smog, ozone and other irritants by a form of nitrogen oxide called the nitrate radical.