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Topic: Re:Re:Re:Widening of the M4
Posted by: Tim Henderson
Date/Time: 21/06/15 20:35:00

Back in December I did browse through the Preliminary Environmental Report and quoted on brentfordtw8 this snippet relating to conditions there :

" "Local operational effects (Opening Year, 2022)
6.14.22 The magnitude of change in NO2 concentrations at sensitive receptors at
junctions 3 to 1 of the M4 is predicted to be small at one receptor (X617)
which is predicted to be above the annual mean objective value with the
Scheme in place. However, this location is unlikely to have Openable
windows, as an apartment block and may therefore already be mitigated
against poor air quality. This increase is due to the proximity of this receptor to the A4 and M4 at junction 2 and an anticipated increase of approximately 4,900 vehicles on the M4. The predictions at X617 have been considered as part of the overall evaluation of significance for operational air quality. However, further work will be undertaken to consider how this location is assessed and whether this location is included in the evaluation of significance for the final ES. The magnitude of change in NO2 concentrations at all other receptors is predicted to be imperceptible resulting in a negligible change in air quality. 203 receptors are predicted to be above (160) or just below (43) the annual mean objective value with the Scheme in place. It is also anticipated that exceedances of the 1-hour mean objective are unlikely in this part of the study area as annual mean concentrations at all receptors are less than 60 μg/m3."

The maps showed that X617 was a single point ("receptor") representing the whole of the Great West Quarter while on the other side of the road each terraced house was an individual receptor! "

I may be mistaken,but I think the report also assessed the effects of increased traffic on CHR. Air quality modelling in the future scenarios is,  I think, still suspect as how effective new Euro6 diesel engines are at achieving the targetted emission limits in real-world driving conditions is still to be demonstrated.Previous history has been disappointing.

Entire Thread
TopicDate PostedPosted By
Widening of the M420/06/15 19:58:00 Rima Jones
   Re:Widening of the M420/06/15 20:04:00 Will Watson
      Re:Re:Widening of the M420/06/15 22:19:00 Rima Jones
         Re:Re:Re:Widening of the M421/06/15 08:09:00 Rima Jones
      Re:Re:Widening of the M420/06/15 23:35:00 Richard Jennings
         Re:Re:Re:Widening of the M421/06/15 09:34:00 Elizabeth Jane Daley
            Re:Re:Re:Re:Widening of the M421/06/15 12:51:00 David McLoughlin
               Re:Re:Re:Re:Re:Widening of the M421/06/15 13:11:00 Rima Jones
         Re:Re:Re:Widening of the M421/06/15 20:35:00 Tim Henderson
            Re:Re:Re:Re:Widening of the M406/09/16 18:14:00 Tim Henderson
               Re:Re:Re:Re:Re:Widening of the M406/09/16 18:29:00 Viv Griffiths
                  Re:Re:Re:Re:Re:Re:Widening of the M407/09/16 00:07:00 Richard Jennings

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