I'm gonna stick a "citation needed" here. I have discerned no obvious difference in air quality from wood burners in the winter so unless London has a lot of folks burning wood in the summer I find it unlikely. As for Fireworks, their usage is so infrequent that I find the idea of "often" slightly confusing
.Disclosure, my family had open fires and then log burners for as long as I've been alive. Not in London where I now live. I love a proper fire, it's great, one of the things I enjoy about visiting family in the countryside.
I am, however, ambivalent about the things and wouldn't resent them being banned.