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Table 2.
Daytime (11:00 – 16:59 local time) ozone trends based on seasonal median values at 6 US and 2 European rural sites between 1990 and 2010

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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