Page 15 - Swale AQMA Feasibility Study April 2020_

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

NO 2 annual mean concentration (μg.m )
-3
Monitor Type In AQMA? Location

2016 2017 2018 2019*

Squirrel
SW113 R N Cottage, - - 69.3 74.5
Keycol Hill

SW62 K N Key Street 38.3 40.6 33.7 33.7

SW112 R N 56 Key Street - - 35.4 33.4

76a Key
SW111 R N - - 40.9 38.2
Street

Squirrel
Cottage
SW121 R N - - - 42.7
Façade,
Keycol Hill

13 Key Street
SW122 R N - - - 21.2
Façade

12 Key Street
SW123 R N - - - 27.3
Façade

31/33 Keycol
SW124 K N - - - 52.3
Hill (Highest)
Note: “K” = Kerbside; “R” = roadside. Bold denotes exceedance of the annual mean AQS.
Underline denotes indicative exceedance of the 24 hour AQS.
*2019 data is bias adjusted, but has not yet been approved by Defra. The data is to be included
in SBC’s 2020 ASR.

3.16 The data in Table 3.6 indicate that annual mean NO2 concentrations along the
-3
A2 has been shown to exceed the annual 40μg.m AQS. However, the vast
majority of diffusion tube concentrations, including those within Newington’s
AQMA, have decreased between 2016 and 2019.

-3
3.17 The highest recorded concentration in 2018 was 69.3μg.m at SW113 (Squirrel
Cottage, Keycol Hill), this location is outside the existing AQMA and is 73.3%
above the AQS. A further exceedance is identified at SW111 (76a Key Street),
2.3% above the AQS in 2018.
3.18 Although the 2019 data has yet to be submitted to Defra in the Annual Status
Report (ASR), it has been bias adjusted (ratified) and can be used as an
indicator of the current trends, with approximately 85% of concentrations
decreasing since 2018.

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