Nitrogen oxides are harmful gases (which contribute to Acid rain and global warming) emitted as a Byproduct of fossil fuel combustion.
Other /More definition:
A nitrogen oxides (NOx) is a group of gases that cause Acid rain and other environmental problems, such as smog and eutrophication of coastal waters. Burning fossil fuels, such as coal and gasoline releases NOx into the atmosphere. Various programs are reducing NOx emissions, including the Acid Rain Program and NOx cap and trade programs.
Other /More definition:
Nitrogen Oxides are Nitrogen Oxides include various nitrogen compounds like nitrogen dioxide and nitric oxide. These compounds play an important role in the atmospheric reactions that create ground-level ozone and acid rain. Ozone is formed when and volatile organic compounds (VOCs) react in the presence of heat and sunlight.