Harringay, Haringey - So Good they Spelt it Twice!
HCG's air pollution monitoring with Wightman open and closed
Following on from the 2015 study, here are the results from this year's study comparing the NO2 levels around Harringay last year when Wightman Rd was open to the same period this year while it is closed.
Tags for Forum Posts: traffic, wightman bridge closure
Replies to This Discussion
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Permalink Reply by Alice Mezzo on
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Is there a legal case to be made?
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The council, for failing to take action.
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Permalink Reply by Rich on
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Is there any reason why some of the sample points don't have before/after comparisons. It seems a bit pointless to have sample points where the other doesn't exist. It's a shame there isn't any sample points at many of the other places that have been effected by the changes, as it would be nice to know if they have actually got worse or not and if so by how much, as so much of this debate has ended up been subjective.
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Permalink Reply by The Harringay Community Group on
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To reply to some of the comments - this study is a comparative followup to the one done last year so the sensors were mostly just in the same locations. Its one of the bigger studies done of a small area around here, and it was done over the same dates as the annual nationwide local authority monitoring period so it will be possible to make comparisons with those results over a wider area.
About 15% of the sensor were lost, nicked, or the post they were on knocked down, or removed due to road works. One of those lost was unfortunately the ground level sensor below the 3rd floor sensor on Green Lanes. However the 3rd floor reading does still provide useful data. If the 3rd floor location was say a really windy location then it wouldn't be showing a very high reading as the air going by the sensor would have been from somewhere else, and that somewhere else would most likely not be as polluted as this congested but of Green Lanes, so the sensor should have a low reading but it doesn't. From studies of comparable situations apparently a sensor at the 3rd floor height like this would get possibly something like 10% to 40% lower reading than near the ground.
Even at 40% that would put the ground level value at 42 which is still 21% lower than the 2015 reading. That happens to be in the ball park of the decrease of all the other busy locations in these results - Green Lanes by Allison down 26%, Green Lanes by Beresford down 24%, Turnpike Lane down 26%.It would be interesting to compare those results with the before and after traffic counts. The after counts have just been made available, and are attached here.I'm away though so don't have the before counts handy. Can anyone find the before counts for Turnpike Lane and the Green Lanes to see how that compares to these NO2 results?
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The counts are too big to attach to a post so instead are here: http://harringayonline.pbworks.com/w/browse/#view=ViewFolder&pa...
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Its interesting to see the traffic reduction on the Ladder rung roads from the before traffic counts (here) and those after counts:
Sydney 9508 549 94% reduction
Raleigh 11547 1346 88%
Hampden 8555 1389 84%
Lausanne 7411 4750 36%
Frobisher 13352 4779 64%
Falkland 10716 5110 52%
Fairfax 13925 5215 63%
Effingham 12189 5057 40%
Beresford 12842 5195 60%
Allison 6580 4655 29%
Hewitt 5879 4876 17%
Seymour 3386 2671 21%
Warham 17963 4950 84%
Pemberton 11718 7460 36%
Mattison 7393 4330 41%
Ducket 7269 7369 -1% (increase)
Cavendish 6794 3381 50%
Burgoyne 11863 6511 45%
Umfreville 8449 5838 30%
So overall a 54% reduction in traffic on the rung roads(187339 before, 85431 after) . This must give some indication of how much of the traffic is through traffic, and the busy streets with lots of through traffic having the biggest reduction.
(poor Willoughby Rd had traffic increase by 22% though, and a big increase in NO2 too from the result of Willoughby by the corner of Sydney)
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Permalink Reply by John McMullan on
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The lowest reductions were (not counting Allison and Hewitt which were already low) Lausanne, Allison, Willoughby and Pemberton. The first three I can explain: church traffic and through roads, Pemberton I cannot. What on earth is going on that it continues to attract so many vehicles a week despite not being a through route?
Oh and I forgot Duckett which just looks MAD. Anyone?
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Permalink Reply by Nick on
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Perhaps there was not as much rat running traffic as predicted by some on here. The average traffic on the ladder roads post closure is similar to that of the Gardens.
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Permalink Reply by ant on
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The average count for the gardens is 3822, the average for the Ladder with Wightman closed is 4496 so an 18% difference.. Similar'ish. What that says is that the resident access bollards for the Gardens are about as effective as closing Wightman.
We should get resident access bollards for the Ladder, they would solve most if the issues. Through traffic would be largely eliminated. Allowing the local traffic to use the Ladder and Wightman would get it off Turnpike Lane and Green Lanes so the congestion problems there would go away. And all the problems with locals who must use a car having big delays while Wightman has been closed would be solved.
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This sounds like a very sensible idea, I didn't release that resident access bollards were something that are an option. How do these work from a resident point of view, do they have to buy something to use them, or is this provided? Just wondering about the cost aspect (not that I would mind paying for a reduction in pollution), just might be a harder sell
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There is an FOI about the cost of the Gardens bollards here.
So £50K to install and about £2400 per year to maintain. We'd need three sets to protect the entire Ladder. Residents pay an annual fee for the access card, and with the size of the Ladder something like £30 a year would easily cover the annual cost plus build up a big maintenance surplus. This traffic study alone cost the council £250k so you'd think they must have budgeted for a similar figure for implementing the results, which should cover the installation cost, or with interest rates so low just take out a loan for the bollards installation and have the resident annual fee pay off the loan.
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