Well, for example, climate-change-fueled wildfires have draped large areas of California and the western US in wildfire smoke for weeks on end, the last few yea

Well, for example, climate-change-fueled wildfires have draped large areas of California and the western US in wildfire smoke for weeks on end, the last few years. Aside from that, large cities and suburbs can be smoggy, very hot, and extremely hostile to pedestrians, let alone runners. (This is true both in the US, and abroad—the pollution in many modern cities is unreal.) Gyms are expensive, and there is a pandemic.