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 nitrous ions produced by {TAIL ~ the nitrogen dioxide gas} to produce {HEAD ~ a diazo compound} 
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 nitrous ions produced by { TAIL ~ the nitrogen dioxide gas } to produce { HEAD ~ 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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD