Figure 4: Frequency distribution of ozone concentrations in excess of the 180 µg/m3

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Air pollution in the European Union - Exceedance of ozone threshold values in 1995 and summer 1996 - Part II

#Ex	99	27	607	1	99	2	217	38	102	0	191	6	92	5	7
#St	114	22	386	6	132	11	155	42	11	6	69	5	38	9	6

Figure 4: Frequency distribution of ozone concentrations in excess of the 180 µg/m3 threshold for hourly values (April-July 1996). For each country the total number of observed exceedances is given in row '#Ex', the number of stations is given in row '#St'. Frequency distributions are presented as Box-Jenkins plots indicating the minimum, the 25-Percentile, the 75-percentile and the maximum value.