Page 21 - Swale AQMA Feasibility Study April 2020_

AQMA Feasibility Assessment
A2 – Keycol Hill and Key Street, Swale

R14 Keycol Hill 13.1

R15 Key Street 12.9

R16 Key Street 12.9

R17 Key Street 13.4

R18 Key Street 12.7

R19 Key Street 13.4

R20 Key Street 13.1

R21 London Road 11.1

R22 London Road 12.3

R23 London Road 12.5

Note: Bold denotes exceedance of the annual mean AQS. Underline denotes indicative
exceedance of the 24 hour AQS.
4.9 The data in Table 4.3 show that annual mean concentrations of PM2.5 are
consistently below the 25μg.m target value in all modelled scenarios. The
-3
highest modelled concentration of 16.1μg.m was at Receptor R8, 35.6% below
-3
the target value.

Summary of results

4.10 The air quality modelling results based on the 2018 ratified data, show that
there are likely exceedances of the long term and short-term AQSs for nitrogen
dioxide (NO2) on Keycol Hill, but not Key Street.

4.11 Figure 2 and Figure 3 identify the predicted annual average NO2 concentrations
in the year in 2018. These data show likely exceedances on Keycol Hill only and
therefore an AQMA could potentially encompass these locations, as suggested
in Figure 4.

4.12 There were no PM10 AQS exceedances within the model domain and modelling
results for PM2.5 also showed annual mean concentrations are likely to be well
below the AQS target value.

9438 AQMA Feasibility Study.docx Date: 20 April 2020 Page 20 of 20