Seen kitty living in car

I see a van at my local gas station pretty often and it's FULL of garbage and random stuff. I think two addicts live in it - who am I to judge.

Today I noticed a cat in the car and I'm worried about him. It's getting warm, he's a black kitty, and the van is cramped with all that stuff in it.

Is there anything I can do? I'm afraid to call it in to the city because they either won't care or could put the cat down or something else unproductive. I wish I could show a photo here, but I can't add one. Thanks in advance