For some reason drone miners seen to emit pollution on my map. I don't think they did it before.
Not sure if its a bug or not.

They always did

if you press "P" to see production stats, there is a tab that shows pollution. There you will see the drones are makig the pollution.

But I do think they are making less pollution per ore mined than regular miners are making.

@Klonan Thanks! I never noticed for some reason.
@billbo99 For some other, completely unrelated reason, i didn't even think about it:) Thanks!