Trends are reported in units of ppbv yr-1 with the 95% confidence limit and p-value indicated. Statistically significant trends (p<0.05) are in bold font.
*Annual trend at Ispra using:
daytime values (11–16 local time) and all months of the year: -0.23 ± 0.25, p=0.07
nighttime values (00–05 local time) and all months of the year: 0.33 ± 0.24, p=0.01
all hourly values and all months of the year: 0.16 ± 0.23, p=0.17
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