"The WHO, which tightened its air quality guidelines in 2021, warns that no level of air pollution can be considered safe but has set upper limits for certain pollutants."
OK, I stopped reading here. Just like "There is no safe amount of animal protein". Or "No safe amount of ionizing radiation". Total nonsense....
The chemical compound pollution that comes from the exhaust of a modern day car is 98% less than what it came out in the 90-ies. Particulate's main source in a vehicle is the tires. The amount is exponential with weight. Also, in any modern urban environment transport is just about the smallest contributor to particle pollution.
All the above statements are the conclusions of a multi-year EU wide scientific project in which I played a small role.
YET:
1. The powers that be want to see 90% reduction in car ownership (Whaaaaat?)
2. Electric vehicles, which are WAY heavier are perfectly OK - no problem with particle generation there!
3. Synthetic fuels that are carbon neutral are an evil scam by greedy German auto corporations!!!!! - never mind that if the fuel is carbon neutral then you have zero extra investment in infrastructure, lighter cars (much less particles) and fully developed and matured scraping systems at the exhaust (see the 98% reduction).
Funny fact: One of the Chinese representatives in the project said that if China moves from Euro1 to Euro2 legislation, as they intend to do, for the exhaust gasses (We are introducing Euro7 here - the reduction of emissions between the issues is not linear but progressive) that would offset anything that the West can ever do for pollution. So, instead of wasting billions upon billions with constantly worsening ROI (diminishing returns) perhaps we can invest where we get the biggest bang for the buck....