Air Purification Efficiency Assessment on Large City’s Street Road Network by Green Plantings and Photocatalytic Cleaners

Abstract

Methods for organization of air purification on Yekaterinburg city’s street road network are considered.Air pollution by motor
 transport and a polluting substances stream to the car salon are estimated with a use of the received consistent patterns,
 dispersive models, transport streams’ characteristics, and data on current weather conditions. On a streams’ balance basis
 a permissible density of cars (on the non-exceedance of CO maximum permissible threshold) on the city’s territory (no
 more than 12-12.5 cars/sq. km) taking into account their emissions and work of photocatalytic cleaners in vehicles’ salons
 and photocatalytic coverings on the street road network surfaces (acoustic screens, sidewalks, buildings), and also due to
 processing of the polluting substances by different types of wood vegetation (protective forest strips, parks and forest parks)
 has been established. It has been defined that the removal of CO by means of available city vegetation is equivalent to
 additional presence on the city’s streets of 0.2-0.4 % of cars of the operated transport’s total number without air deterioration.
 A necessary area of an active surface for photocatalytic cleaners in the car salon (0.1 sq. m), bus salon (0.5 sq. m), and also a
 width of protecting surfaces with the deposited photocatalytic coverings near the pedestrian zone (5m) are estimated in this
 work. It has been established that sharing of the considered cleaning methods is capable to lead to annual decrease of carbon
 oxide from 0.14 to 6 %, and nitrogen oxides from 0.15 to 5.78 % in average concentration around the city.