Researchers in Copenhagen have created a market-ready anti-pollution filter designed to quickly remove nitrogen dioxide (NO2 ... air into the car from the exhaust of cars in front of you.

One big problem is that the gasoline and diesel they use creates exhaust ... Two other ingredients in exhaust are nitric oxide (NO) and nitrogen dioxide (NO 2), which lead to acid rain. Acid rain ...

unit that works with a urea-based diesel exhaust fluid (DEF) to convert NOx into nitrogen, carbon dioxide, and water vapor. Diesel trucks that don't use an SCR have an exhaust gas recirculation ...