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A study showed no improvement in air quality in Scotland despite big reduction in vehicle use.
"‘This suggests that vehicles aren’t an important cause of this very harmful type of air pollution in Scotland – and people may be at greater risk from poor air quality in their own homes, especially where cooking and smoking is taking place in enclosed and poorly ventilated spaces.’ "
https://airqualitynews.com/2020/09/08/pm2-5-pollution-did-not-decline-during-lockdown-in-scotland/
See also cooking, smoking, candles, barbeques, muirburn, garden bonfires, firepits....
Part of the rationale behind LEZ/ULEZ zones in cities is that particulate pollution is blown away and dispersed before being damped down by rain. So it's only really an issue if it's being produced in an inhabited area.
So a diesel lorry on the motorway is less of an issue than say, burning wood in your house for 6 months of the year.
A study showed no improvement in air quality in Scotland despite big reduction in vehicle use.
That's not what it says. It says that there was no reduction in fine particulate (PM2.5) pollution during lockdown. From the article (I couldn't see a link to the study) it doesn't appear that other forms of air pollution were measured.
True. Lazy paraphrasing on my part. NO2 did go down.