!!!Ozon

Ozone, triatomic form (O%%sup 3/%) of oxygen, colourless, highly 
reactive gas with a pungent odour. Prolonged exposure to abnormally 
high concentrations of ozone can cause eye and airway irritations in 
human beings and damage to plants. Ozone monitoring on the basis of 
uniform standards has been carried out at 120 measuring points 
throughout Austria since 1989. The Ozone Act (Law Gazette (BGBl) 
210/1992) requires ozone concentration monitoring throughout the 
territory of Austria and stipulates threshold values (three-hour 
averages): Early warning stage at 0,2 mg/m%%sup 3/%, warning 
stage 1 at 0,3 mg/m%%sup 3/% and warning stage 2 at 
0,4 mg/m%%sup 3/%. In northern and eastern Austria the early 
warning stage is reached on up to 20 days a year, in the rest of 
Austria only occasionally.


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