Effect of Japanese Legal Control of Vehicle Exhausts on Photochemical Smog Control 830120

Japanease legal control of HC and NO_x emissions from motor vehicles have a sufficienteffect on controling photochemical smog in HC-NO_x reaction system. This thing was obtained through numerical simulations in effect equivalent to dynamic smog chamber tests using a simplified box model consisting of a reaction module and some environmental factors. Concerning the dilution capacity of R=100 %/h, if the emission flux of NO_x is controled so as not to exceed 0.058 ton/km³h, the maximum concentrations of O₃ and NO₂, can be lowered to 0.10 and 0.023 ppm. More over, simultaneous control of both the HC and NO_x so as not exceed 0.58 and 0.27 ton/km³h respectively, is predicated upon meeting both the Japanese O₃ and NO₃ air quality standards. It turns out that this control admits ample traffic volume 6100 cars/km², and is a considerably more cost-effective strategy.