I don't solder very often
Then quit worrying about it.
As another poster said, the air in your city is probably almost as bad and you probably don't walk around wearing a gas mask when you need to stroll to the shops.
Just blow the flux smoke away as you go, open a window if they really annoy you, but for occasional soldering unless they trigger an allergy/asthma for you, it's just not an issue.
If you are soldering a lot, often, then a fume extractor is recommended.
Since you have only 2 posts, I will address the misconception that people sometimes have that drives fear of soldering - an extractor, or mask in your case, is not about lead content, you are not vaporising lead, the smoke is not lead, you are not taking on any appreciable level of lead from occasional handling of solder, the smoke from soldering is from the flux, which is mostly rosin (colophony), which is derived from resin from trees.