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A large green wall might mitigate some/all of the CO2 of a single car's regular idling, but it won't do much (or, more importantly, enough) about particulates and various other gasses (NO2, etc).https://www.sempergreen.com/en/solutions/living-wall/living-wall-benefits"1 m2 of living wall extracts 2.3 kg of CO2 per annum from the air and produces 1.7 kg of oxygen . With a living wall you contribute to air purification."How much CO2 does an idling car produce? A quick google gives:-https://www.quora.com/How-much-CO2-is-emitted-from-an-idling-car-for-10-minutesThe lowest figure in there would mean about a third of a kg of CO2 produced by a car idling for 10 minutes.So, if someone idles for 10 minutes outside school every school day for a year (195 school days per year) that's 65kg of CO2 unnecessarily produced.A living wall 2m high would need to be 14m long in order to extract the same quantity of CO2 from the air over that same year for that single car.A bunch of cars idling outside most days? That's a lot of green wall required. Surely it'd be much easier to just stop the cars idling in the first place rather than going "It's fine! There's a green wall right there!"Most schools already have a School Travel Plan and TfL supports this with its STARS accreditation programme and some increasing levels of funding for other activities:-https://www.wandsworth.gov.uk/roads-and-transport/transport/school-travel-plans/about-school-travel-plans/Forcing the teachers to police the problem outside schools is often tricky as the teachers want to avoid such confrontation with parents. I've seen just how some parents at my daughter's school react when they are picked up on their anti-social parking or refusing the switch off engines whilst waiting.

Alex Greenbank ● 2674d

Hello Richard,While I can wholeheartedly understand what you are trying to do, I think the listing you have just posted is rather unfair, to qualify it as something:- enabling local authorities to make "reasonable profits" (what is reasonable?) from their charging Clean Air Zones to fund further local air pollution abatement policies (which are?)- making it compulsory (???) for local authorities with a charging CAZ to introduce a citizen-based reporting system to increase the enforceability of anti-idling measures (when does an engine become idling as opposed to waiting for a traffic light to change?)Draconian measures indeed.  Are they needed?  Perhaps I would not disagree entirely.But I favour measures to improve matters - one of them planting more trees and less concrete buildings - particularly high raised ones that block circulation of air among other descriptive qualifications.Should car use be restricted?  Perhaps I agree with this but only, and this is a very big only, the person driving the car is an able bodied person who can race on bicycles up a hill laden with shopping on the handle bars. The other question.  It has become apparent that the main culprits of air pollution are cows.  Any ideas on this? What happens to farmers who will have to stop in the not too distant future from raising cows?  What about pigs?And, a most pressing question, what about polluting buses?  On our street, we have between 850 an 1000 buses driving up and down it every day.  My window sills are a testament of the pollution the produce.  Will they be subject to "reasonable profits" for the Council?  What about their idling engines while waiting in traffic?  Will citizen-based reporting systems apply to them as well?

Ivonne Holliday ● 2645d