The monitoring of ozone immissions in rural and urban areas.
It has been shown, by a statistical study of the concentrations of ozone in air as measured by two monitoring stations--one being situated in an urban and the other a rural area--that photochemical smog episodes to occur. The ratio O3 urban/O3 rural is normally less than 1. This ratio, however, has been shown to be greater than 1, when certain conditions prevail, notably on days of high solar radiation and low velocity winds. At nigh-time, in the absence of photochemical reactions, the higher concentrations of ozone observed in town as opposed to the country side has been attributed to air transport phenomena.
D000388:Air / Q000032:analysis*; D006801:Humans; D010126:Ozone / Q000032:analysis*; D012424:Rural Population; D013557:Switzerland; D014505:Urban Population
D010126:Ozone