Ozone pollution in London and Edinburgh: spatiotemporal characteristics, trends, transport and the impact of COVID-19 control measures.

The main findings reveal that most of the criteria pollutants show a decreasing trend in both geographies over the seven-year period, except for O3, which presents a significant ascending trend in London and a milder ascending trend in Edinburgh.

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The visual representation of the trend component of the two GAMs ( Figure 8 (a,b)) confirms that O3 concentrations have registered an increasing trend over the 7-year period in London (panel a) and Edinburgh (panel b), whereas the graphical representation of the seasonal component ( Figure 9 (a,b)) reflects the strong seasonal effect on O3 concentrations that are highest in April–May at both sites. 3.4.

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