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This is a few years old (2019), but it's for London only (by the GLA).
Transport was responsible for 30% of PM2.5 in London and domestic biomass/wood burning was second at 16%, followed by building sites at 15%.
The report mentions there's already a plan in place to ban ALL combustion in cities (at certain times) to help us reach the WHO 2030 PM2.5 target.
If you're really worried about PM2.5, then I'd get a sensor to check your background levels (which will most likely be less than 15mg/m3), I'd consider an air purifier if you're above 50mg/m3.
Also: stop celebrating pancake day, NEVER use joss sticks and avoid walking next to roads...
JonoMarshall
It's the main source of pollution in London now:
https://www.theguardian.com/environment/2022/feb/15/wood-burners-emit-more-particle-pollution-than-traffic-uk-data-shows
Disappointing to see a load of ageing hipsters putting their own hygge over healthy air for 9 million people.