When nitrogen dioxide gas enters the pores of the nitrogen dioxide gas sensor element with the above arrangement and is adsorbed to the pores, the diazotizing reagent reacts with {HEAD ~ nitrous ions} produced by {TAIL ~ the nitrogen dioxide gas} to produce a diazo compound 
produced by
When nitrogen dioxide gas enters the pores of the nitrogen dioxide gas sensor element with the above arrangement and is adsorbed to the pores , the diazotizing reagent reacts with { HEAD ~ nitrous ions } produced by { TAIL ~ the nitrogen dioxide gas } to produce a diazo compound
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH