---- suspect this to be entirely dishonest proaganda.
1) They are comparing pre-lockdown levels of traffic- when "working from home" was almost zero, with post-lockdown -- many people continue to work from home, assuming they still have a job. There are massively fewer cars on the road than there were. Less pollution is a good thing, but fewer jobs? not so much. (I am retired).
2) They viciously forced people to sell older cars prematurely rather than allow them to be replaced at the normally time (I never replaced my car, as I could not afford one having only got scrap value for the old one - of course I resent this and feel bloody minded towards thee whole thing. i am not alone). Fewer cars - more poverty.
3) Electric cars because petrol is very, very expensive. We pay about £1.80 per LITRE! (Not Australian pounds - Slashdot still cant get this right!)
4) Global warming means less pollution from household boilers - no firm data on this.
Moral: the research finds what they were paid to find.
(A good researcher usually finds more research is needed if he wants to keep his job).