3 PM10Projections for 12 additional sites based on 1995 and 1996 data
3.1 Projections for comparison with NAQS objective
Projections for comparison with the NAQS objective have been calculated for an additional 12 monitoring sites using PM₁₀ measurement data for 1996 and 1995 (where available) and these projections are shown in Table 3.1 and Table 3.2. A receptor model using daily mean NOx and sulphate concentrations has been used along with a business as usual emissions scenario. The projected NAQS 99th percentile is greater than 50 mgm-3 for all projections based on 1996 measurement data. The 99th percentiles predicted on the basis of 1995 measurement data are just below 50 mgm^-3 for Leicester Centre and Southampton Centre.

3.2 EU Daughter directive projections
Projections for comparison with the EU Daughter Directive limit values have also been calculated for these additional 12 sites and are shown in Table 3.3 and Table 3.4. The Stage 1 24-hour limit value is seen to be at risk of being exceeded at Swansea and Sheffield centre site for the business as usual scenario. The Stage 2 limit value is likely to be exceeded at most sites. As before, the TEOM PM₁₀ measurements have been multiplied by a factor of 1.3 for comparison with the EU limit values.