Click chart for full time series	Click chart for full time series
Monthly trends
	Groups of sites: Abbey Road to Maida Vale Finchley Road - Wellington Road Central sites Schools Avenue Road and neighbourhood
Click chart for each group of sites	Click a name to open chart for the given group of sites

Trends in annual averages

	Groups of sites: Abbey Road to Maida Vale Finchley Road - Wellington Road Central sites Schools Avenue Road and neighbourhood
Click chart for each group of sites	Click a name to open chart for the given group of sites

Supplementary charts