Do you find it "viable" opening a shop where you can sell "fresh air", in a polluted city? Should there be a "free" trial period to encourage people?

<p>Though this type of shops has already touched the market with success in China crowded cities, still in some other areas in the world people are a little "reluctant" to get "fresh air" sold in an oxygen mask. In any case, people are still breathing isn't it? They don't feel the need of getting such product, though so wanted when we are in the nature and compare it with the city's air. How people that have never left or got used to the city pollution, can be convinced to breath "healthy" air.</p>