People (including myself) are already saying this.
I live in an Easter European major city and when traveling to a civilized country (yes fellow eastern europeans, hate me for saying this) I'm always take aback by the quality of the air. I've recently visited Stockholm and the amount and variety of mushrooms growing in small urban parks surprised me -- I'm sure there's many orders of magnitude less pollution there than where I live.
I live in an Easter European major city and when traveling to a civilized country (yes fellow eastern europeans, hate me for saying this) I'm always take aback by the quality of the air. I've recently visited Stockholm and the amount and variety of mushrooms growing in small urban parks surprised me -- I'm sure there's many orders of magnitude less pollution there than where I live.