Firstly, mars soil is extremely toxic and if inhaled can kill the user immediately, we see multiple times matt damon enter his station with dust on his suit, even a small part of this in the air is deadly, the decompression does nothing to this.

He also just walks into his Rovers and they seem to be perfectly clean every time, no dust, nothing, and he also just goes and sits down with his dusty suit on, and just takes his helmet off like that's totally safe... No.

Any astronaut living like this on mars would of died after a week.