Site specific projections for roadside sites are shown in Figures 23 to 37.

Figure 23   Comparison of measured NOx and NO2 concentrations at London Cromwell Road with projections based on 1995 monitoring data.
Figure 24   Comparison of measured NOx and NO2 concentrations at London Sutton Roadside with projections based on 1997 monitoring data.
Figure 25   Comparison of measured NOx and NO2 concentrations at London Tower Hamlets Roadside with projections based on 1997 monitoring data.
Figure 26   Comparison of measured NOx and NO2 concentrations at London Haringey Roadside with projections based on 1997 monitoring data.
Figure 27   Comparison of measured NOx and NO2 concentrations at London Camden Roadside with projections based on 1997 monitoring data.
Figure 28   Comparison of measured NOx and NO2 concentrations at Exeter Roadside with projections based on 1997 monitoring data.
Figure 29   Comparison of measured NOx and NO2 concentrations at Bristol Old Market with projections based on 1997 monitoring data.
Figure 30   Comparison of measured NOx and NO2 concentrations at Bath Roadside with projections based on 1997 monitoring data
Figure 31   Comparison of measured NOx and NO2 concentrations at Glasgow Roadside with projections based on 1997 monitoring data.
Figure 32   Comparison of measured NOx and NO2 concentrations at Loncoln Roadside with projections based on 1997 monitoring data.
Figure 33   Comparison of measured NOx and NO2 concentrations at Bury Roadside with projections based on 1997 monitoring data.
Figure 34   Comparison of measured NOx and NO2 concentrations at London A3 Roadside with projections based on 1997 monitoring data.
Figure 35   Comparison of measured NOx and NO2 concentrations at Norwich Roadside with projections based on 1998 provisional monitoring data
Figure 36   Comparison of measured NOx and NO2 concentrations at London Marylebone Road with projections based on 1998 provisional monitoring data.
Figure 37   Comparison of measured NOx and NO2 concentrations at Hove Roadside with projections based on 1998 provisional monitoring data.

Projections have been calculated for all sites with at least one year of measurement data and are based on 1997 monitoring data for most of the sites. Sites classified as both Kerbside (within 1 m of the kerb) and Roadside (generally 1 - 5 m from the kerb) have been included. Projections for Cromwell Road are based on 1995 data, the most recent year with reasonably complete data capture. The projections for Norwich Roadside, London Marylebone Road and Hove Roadside are the same as those included in the review of the NAQS, which were based on provisional measurements covering most of 1998. The roadside enhancement of NO_x concentrations at each site was calculated by subtracting mapped estimates of background concentrations (from Stedman, 1998) for the 1 km grid square including the location of the roadside site from the roadside annual mean measurement. The roadside enhancement of NO_x was then projected forwards and backwards on the basis of the estimates of UK urban road traffic emissions listed in Table 1. The background component was projected on the same basis as the site specific projections for urban background sites in section 4, with 10% of 1996 emissions remaining constant throughout. The graphs show the following information:

• projected annual mean NO₂ based on 1997 NO_x measurements, calculated from NO_x projections using a non-linear relationship between NO_x and NO₂ derived from 1996 UK national monitoring data at roadside sites. These are the values included in Table A10 of the review of the NAQS report.
  
• measured annual mean NO₂.
  
• projected annual mean NO_x, based on 1997 NO_x measurements.
  
• measured annual mean NO_x.
  
• 21 ppb line, the NAQS objective for the end of 2005.