So, secondary succession would occur. Once there is no humans, there is nothing to keep electricity going (or maybe, idk) but everything to our houses, to big a$$ buildings, will be overtaken by the plants that will be able to grow.
Secondary succession is basically just plants and animals making their habitat’s back to theirs after a huge disturbance in their area (humans are the example in this). They finally are given the room to grow again, and I think the Earth would get healthier due to the inability for humans to pollute actively.
Though, I think there are some areas where the pollution may continue. @Discussions do you have any ideas on what those areas might be and why it might not allow secondary succession to occur?