Air Quality in Galgate – Part III

In this blog post I continue my look at the appalling air quality in the small village of Galgate, located a few miles south of Lancaster. In the first part here, I carried out some simple air quality modelling and assessed how bad the situation could/will become if developments are continued to built at the current rate. In the second part here, I looked at an air quality assessment that was submitted with a proposal to build 50 new dwellings. In that report, DEFRA’s Technical Guidance was followed, which is far too optimistic on future vehicle emissions, and hence suggested that there would be no problems with air quality by 2017. Quite obviously the current guidance isn’t worth the paper it’s written on.

In this post I will be looking at another new housing development, this time off Stoney Lane. In the image below, the badly drawn black line is the border of this new development. The Galgate Air Quality Management Area (AQMA) can also be seen, along with the Ancient Woodlands of Cockshades and Little Cockshades.

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This development is almost finished, and the houses don’t look too bad, if slightly generic.

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As with my previous analysis, an air quality assessment was required, but this time the local authority insisted that 2013 vehicle emission factors should be applied to the 2019 opening year. This assumes that there will not be any improvement in vehicle pollution, although there probably will be some. The real world vehicle emissions of diesels has not improved as much as expected, despite new EU Legislation. Volkswagon scandal anyone? The air quality assessment was once again written by GEM Air Quality LTD. The assessment also takes into account any committed developments that have already been given the go ahead, which is industry standard.

First off, the development is expected to generate 395 vehicle movements per day along Stoney Lane. When this development and the committed developments are included, there is expected to be an increase of 1500-1700 vehicles per day through the A6 crossroad in Galgate. This is through the AQMA. The transport data was supplied by i-Transport LLP, a firm that I’ve never worked with, although these figures do sound fairly realistic.

So what does the air quality assessment say about the air quality in Galgate in 2019. The report was written in January 2015, and a couple of months later the Institute of Air Quality Management (IAQM) issued new guidance with respect to planning and housing. Previous guidance allowed for a certain amount of interpretation, while the new guidance is quantitative, with no wiggle room. The relevant section can be seen below.

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The results from the Stoney Lane development, using the new guidance, place the impacts as ‘Slight’ to ‘Moderate’. When the other committed developments are included, the impacts are ‘Moderate’ to ‘Substantial’. It doesn’t get any worse than ‘Substantial’, and my opinion is that ‘Substantial’ should be replaced with ‘Holy Sh*t’.

The air quality assessment written by GEM includes some mitigation measures for the vehicle impacts. In full, these are to plant a few trees, and the developer may want to supply some electric vehicle charging points. Completely useless.

What is interesting is that the Environmental Health Officer with Lancaster Council recommended refusal based on the air quality assessment. In my opinion this was the correct decision. Somewhere along the line, decisions were made that the health of local residents in Galgate is not as important as new housing developments. If I lived along the A6 in Galgate I wouldn’t be happy with this.

In Part IV of my series of blogs I will look at methods that could improve the air quality in Galgate.

Air Quality in Galgate – Part II

Welcome to Part II of my series of blogs about the air quality in the small village of Galgate a few miles south of Lancaster. In Part I, I did some air quality modelling and suggested that the air quality in Galgate is only going to get worse. Part II looks at a case study from a development in Galgate that has just been completed. Looks quite nice.

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Towards the end of 2012 a planning application was made for 50 residential units. The new access road would be built directly off the A6 in Galgate, south of the crossroads and north of the railway bridge. The image below once again shows the location of the Air Quality Management Area (AQMA) in Galgate.

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Every trip generated by this development would have to pass through the AQMA, so an air quality assessment was required. It was prepared by Gem Air Quality Consultants Ltd and I’ve had a good look through it. Documents related to a planning application are all available on the Lancaster Council website, although they can take a bit of hunting. The report is concise and well written, although guidance has changed in the last couple of years. The air quality modelling was done using the proprietary software ADMS, rather than the free DMRB, which was what I used in Part I.

An air quality assessment will model the air quality for the last full year before the application, so in this case, the report was written in 2012, with the data used in the modelling from 2011. An assessment will then use the verification results to model a future year scenario, generally five years later, in this instance 2017. The future year will model the air quality both with and without the development, so that the impacts of the development on its own can be shown.

Gem have used the same diffusion tube locations that I did, as can be seen on the image above, but they have also modelled them for the opening year scenario. I have got hold of diffusion tube results from 2015 so we can compare the actual results with the modelled results for 2017. I know there is a couple of years difference, but the results should be similar.

The results from the diffusion tubes at locations V, Z and ZC in 2011 were, 43, 41 and 37 micrograms per cubic meter. In 2015 the concentrations at all three sites had increased, so the air quality has got worse. The results from the air quality assessment for 2017, modelled the concentration at the diffusion tube locations as 31, 30 and 27. This is a very big improvement in air quality, which has not materialised. This is important, as planning decisions can hinge on things like this, so why the big difference.

The first thing to note is that this isn’t an issue with the air quality assessment, this was done using the most up to date guidance at the time. The problem is primarily with the emission factors toolkit. This is a spreadsheet that calculates the emissions from vehicles on the road in the UK, and as older cars are scrapped and replaced with more efficient newer cars, the volume of polluting emissions decreases. Unfortunately, real world emissions have not been decreasing as quickly as expected for various reasons, for example, the Volkswagon diesel scandal.

Many local authorities realised that air quality assessments did not resemble real world scenarios, so now most assessments will include future scenarios modelled with emission factors from the present day. This will give a ‘worst case’ scenario, although as I have demonstrated here, ‘worst case’ is probably what is happening in Galgate.

Finally, is there anything that I would add to the assessment that was done for this development. Guidance has moved on, so you would have to include something about the railway line passing so close to the new houses. I would also liked to have seen something about designated habitats, for example Sites of Special Scientific Interest, of Local Nature Reserve. Close to the proposed development there are two ancient woodlands, Cockshades Wood and Little Cockshades Wood, as can be seen in the image below.

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From the guidance, neither of these woods are close enough to the development to be effected by it, but it’s always nice to know that a consultant has looked at these things, because the next assessment might be sharing a border with a conservation area.

Part III will examine a more recent air quality assessment from another development in Galgate, coming soon. In the mean time, if you want me to have a look at an air quality assessment for a development that you have concerns about, send me a message.