E Instruments is now offering Simple, Total, and True NOx (Nitrogen Oxides) detectors for summer 2014. NOx refers to a group of highly reactive gases. Each gas contains nitrogen and oxygen in several different amounts and configurations. Most are colorless and odorless, but particles including nitrogen dioxide or NO2 produce a reddish-brown layer of smog over high population areas. NOx gases form as a byproduct of combustion processes such as the use of motor vehicles, electric utilities, and various residential, commercial, and industrial systems. E Instruments has several emissions analyzers available this month to accomplish NOx measurements.