Newlands Cross Upgrade EIS - European Investment Bank

South Dublin County Council N7 Newlands Cross Upgrade
Environmental Impact Statement
Arup Consulting Engineers
Table 9.12 Results of DMRB Modelling for Design Year 2025
Receptor Description Scenario
R1 N7 East
R2 Belgard Road
R3 N7 West
R4 Fonthill Road
9.5.3.2 Breeze ROADS Assessment
CO
(µg/m 3 )
Benzene
(µg/m 3 )
NO2
(µg/m 3 )
PM10
(µg/m 3 )
PM2.5
(µg/m 3 )
Air Quality Standards 2000 5 40 20 25
Do Min 398.8 2.52 26.86 17.29 10.374
Do Something 393.16 2.51 26.46 17.17 10.302
Increase/Decrease -5.64 -0.01 -0.4 -0.12 -0.072
% Increase/decrease -0.3 -0.2 -1.0 -0.6 -0.3
Do Min 404.94 2.5 26.02 17.26 10.356
Do Something 391.4 2.47 25.15 16.99 10.19
Increase/Decrease -13.54 -0.03 -0.87 -0.27 -0.162
% Increase/decrease -0.7 -0.6 -2.2 -1.4 -0.6
Do Min 395.15 2.51 26.57 17.21 10.326
Do Something 389.02 2.5 26.1 17.08 10.25
Increase/Decrease -6.13 -0.01 -0.47 -0.13 -0.078
% Increase/decrease -0.3 -0.2 -1.2 -0.7 -0.3
Do Min 429.89 2.56 27.83 17.8 10.68
Do Something 464.63 2.6 29.42 18.44 11.06
Increase/Decrease 34.74 0.04 1.59 0.64 0.384
% Increase/decrease 1.7 0.8 4.0 3.2 1.5
The total predicted pollutant concentrations including the output values from the BREEZE
ROADS model combined with the background concentrations for the design year, 2025 are
presented in Table 9.13 below. The model output values are representative of the worst case
receptor values.
The receptor showing the highest concentration of pollutants (including the background
concentrations), as a result of the proposed scheme is Receptor 4 (refer to Figure 9.3).
For Receptor 4 the annual average concentrations of NO2 are predicted to be 23.5 μg/m³,
which complies with the AQS of 40 μg/m³ (refer to Figure 9.5); the annual average
concentrations of PM10 are predicted to be 16.5 μg/m³ which complies with the existing AQS
of 20 μg/m³; annual average concentrations of PM2.5 are predicted to be 9.9 μg/m³, which
complies with the proposed concentration cap of 25 μg/m³ and the annual average
concentrations of benzene at Receptor 4 are predicted to be 2.4 μg/m³, which complies with
the AQS of 5 μg/m³;
The model output concentration of CO experienced at Receptor 4 is given in terms of an 8hour
average concentration. The predicted output is 69.5 μg/m 3 , which complies with the 8hour
average AQS of 10,000 μg/m 3 . However, this does not take into account the background
concentration of CO, which is detailed in terms of an annual mean concentration and cannot
be summed with the 8-hour mean concentration value. Nonetheless, since the annual CO
background concentration of 359.1 μg/m 3 is so small compared to the annual mean CO limit
of 2000 μg/m 3 , it is reasonable to contend that even with the addition of the background
concentration the total predicted CO concentration will continue to comply with the AQS
limit standards.
All predicted pollutant concentrations comply with the relevant AQS at all receptors.
December 2007 Page 153