NOx is a commonly used term to describe a group of very toxic and highly reactive gases. These gases include nitric oxide (NO) and nitrogen dioxide (NO2).
NOx affects the quality of air, soil and water through acid rain with direct negative influence on human health. These gases also play a role in increasing the greenhouse effect and escalating global warming.
The most common sources of NOx are generated from within different industrial processes, such as, power generation plants, sea vessels and marine equipment, cars and trucks. According to recent studies traditional municipal wastewater treatment plants are also contributing to it, when recovering nitrogen from the water.