Cool nitrogen tetroxide is compressed and heated, causing it to dissociate into nitrogen dioxide at half the molecular weight.
en.wikipedia.org However, nitric oxide is rapidly oxidised in air to nitrogen dioxide.
en.wikipedia.org Nitrogen dioxide is hydrated to produce nitrous acid which then oxidizes the sulfur dioxide to sulfuric acid and nitric oxide.
en.wikipedia.org He also published on the ionization of hydrogen, carbon dioxide, nitrous oxide, nitrogen dioxide, water vapor, sulfur dioxide, and carbon disulfide.
en.wikipedia.org These dangerous pollutants are known as the criteria pollutants, and include ozone, particulates, sulfur dioxide, nitrogen dioxide, carbon monoxide, and lead.
en.wikipedia.org