二に酸さん化か窒ちっ素そMeaningsNoun1. nitrogen dioxideKanji used二two酸acid化transformation窒suffocate素elementaryPitch accentにさんかちっそComposed of二にtwo; 2Numeric酸さん化かoxidation; oxidizationNoun窒ちっ素そnitrogen (N)Noun