Solution: Special Space Suit so we can't expand into a bubble
It is 38% less gravity on mars.
The problem is that mars has very little air pressure and if you don't have a space suit, you will need one because if you don't breathe regularly, you'll need to breathe enough, a human can have 8% of the air and you can live for 6 months. We breathe a lot on a regular basis and if you don't breathe enough, you can die, you'll need lots of air on mars, because it is 38% less oxygen.
-Have pollution filters out on mars.
-Pollute the atmosphere so most things get trapped in including oxygen and air pressure.
-We can bring coal and burn it.
-Release tons of poison gas
-Have many gas into the air and up.