Although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogen dioxide emissions there have shown only an insignificant decline since 1993.

Melamine is commonly used in plastics and fertilizer, among other products. Its high nitrogen content can make foods appear to be protein-rich in standard nutrition tests.

As a kind of new engineering material, high Nitrogen stainless steel plays more and more important role in industrial production.