From the simplest thing, choose a bicycle instead of a car, and limit travel by transport, if possible, or choose electric cars. There are not many ways to reduce emissions. More questions to factories and power plants of course.
I would totally agree, it is way better to use bicycle rather than a public transport or a car if it is in ability.
I disagree. Choose a car rather than a bicycle. I mean, nobody chooses a bicycle... percentage-wise, it's almost nobody. So, if you choose a bicycle, you have to breathe harder to pedal. The result is that you take in more smog into your lungs. Then you die from smog poisoning faster.
but if you choose a car over a bicycle then the air will be more polluted, and you breathe that air so you will die anyways