Barely Significant

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4 Discussion In the urban system composed of central cities, sub-central cities, regional central cities and general cities, the construction land within the UDBs of different level cities showed a trend of rapid growth, but pasture land in the central cities, sub-central cities, and regional central cities also showed an increasing trend, which was not the case in general cities.
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.