Cars should be banned from the city centers

Human of 21st century cannot imagine his life without traveling. Although necessity of using cars in everyday life, there are some cases, where presence of them should be limited.
One of areas like that, are city centers. In my opinion, it would be better if there will be no traffic in hearts of our cities.
First of all, poisonous fumes which engines emits are harmful for humans life. Its impact on immune system makes it weaker and can lead to serious diseases. It is especially dangerous in narrow, crowded streets where the air circulation is difficult.
Moreover, traffic and road obstructions often cause traffic jams or minor accidents. What it entails, is impossibility of getting somewhere on time or, in fatal cases – never getting there. What is more, waiting for the traffic light to turn green is irritating and makes a lot of us nervous.
Finally, traffic makes a lot of noise, which, for many people living in a city center is a real curse. It makes it impossible to relax after hard day. Is is especially annoying at night, when we want to sleep.
The list of arguments saying for my opinion is much longer, but above-mentioned ones are the most crucial.