It may produce symptoms of pulmonary damage in workers who perform ensilage tasks. 1. See more. Nitrogen dioxide is part of a group of gaseous air pollutants produced as a result of road traffic and other fossil fuel combustion processes.. Its presence in air contributes to the formation and modification of other air pollutants, such as ozone and particulate matter, and to acid rain. Makes about 78% of earth's atmosphere. This gas plays a vital role in terms of atmospheric reactions, which produce ozone at ground level, making it the main component of smog. Nitrogen dioxide, or NO 2, is a gaseous air pollutant composed of nitrogen and oxygen and is one of a group of related gases called nitrogen oxides, or NOx. Information and translations of nitrogen dioxide in the most comprehensive dictionary definitions resource on the web. Nitrogen dioxide is reddish-brown with a very harsh smell at high concentrations, at lower concentrations it is colorless but may still have a harsh odour. Nitrogen dioxide poisoning is the illness resulting from the toxic effect of nitrogen dioxide (NO 2).It usually occurs after the inhalation of the gas beyond the threshold limit value. What is Nitrogen Dioxide (NO 2)?. Seventh element on the periodic table. Nitrogen dioxide, or NO2, is a brown, highly toxic gas that can be produced by the oxidation of nitrogen (for example, combustion reactions produce NO2 and other oxides of nitrogen, as some of the oxygen reacts with nitrogen in the air) and the reaction of concentrated nitric acid with some metals (examples include copper, silver, and magnesium). Meaning of nitrogen dioxide. Nitrogen dioxide (NO 2) is a reddish-brown gas with an irritating and pungent odor.It goes through transformation when in the air, building toxic nitric acid and organic nitrates. Dioxide definition, an oxide containing two atoms of oxygen, each of which is bonded directly to an atom of a second element, as manganese dioxide, MnO2, or nitrogen dioxide, NO2. nitrogen dioxide - WordReference English dictionary, questions, discussion and forums. All Free. Used in stuff like amonia and plant fertilizers, and found in proteins, so you need it. Nitrogen Dioxide (NO 2) is one of a group of gases called nitrogen oxides (NO x).While all of these gases are harmful to human health and the environment, NO 2 is of greater concern.. April 2018: EPA takes final action to retain the NO2 standards. Definition of nitrogen dioxide in the Definitions.net dictionary. NO 2 forms when fossil fuels such as coal, oil, gas or diesel are burned at high temperatures. Nitrogen dioxide is also produced by atmospheric nuclear tests, and is responsible for the reddish colour of mushroom clouds. 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