16 Years (2006-2021) of Surface Ozone Measurements in Córdoba (Southern Spain): Trends and the Impact of the COVID-19 Lockdown.

For daily averages, both sites presented a positive trend of 0.18 μg m −3 year −1 ( p = 0.59) and 0.15 μg m −3 year −1 ( p = 0.59), while the daily 95th percentiles showed a positive and higher trend (0.27 μg m −3 year −1 ( p = 0.73) and 0.24 μg m −3 year −1 ( p = 0.70)) than daily P5 (0.10 μg m −3 year −1 ( p = 0.49) and 0.07 μg m −3 year −1 ( p = 0.46)).

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In this sense, the O 3 concentrations in the coastal area of the southwestern Iberian Peninsula [ 16 ] suggest that changes in the temperature and pressure during 2000–2021 point to a clear trend towards anticyclonic and warmer conditions, which, along with the reduction of precursor emissions, would contribute to the increasing trend of O 3 . 3.2.

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