Addressing pollution- yes country air is cleaner, but can be hellish if you are an allergy sufferer.
Crime- Some rural areas have high crime per capita as there are few prospects for young people, both job wise and extracurricularly.
If your face doesn't fit it isn't friendly at all- you aren't local unless your three generations deep in some places. It can actually be quite lonely.
If weather gets bad you can be stranded and have electricity cut off.
Do you really want to use your car to get everywhere, school, work, to get a pint of milk?
I grew up on a farm and it was lovely until we were about 7-8, we then moved to a small town, with far more for us to do and better job prospects for my parents (as well as childcare options and facilities)
When I was pregnant with DD we moved to a tiny village (just 3 streets) I hated it, it was incredibly lonely with a baby, no bus service and DH at work all day. We now live in a lovely market town which is well serviced, it's friendly (my face does fit, my grandparents live 1/2 a mile away). DD is 10 now and there are lots of clubs, good schools and we can walk to the local supermarket. I could even walk to work with my last job. The country side is literally on our doorstep, a NT place a 15 minute walk from my front door. We really have the best of both worlds and I love it.