I was thinking something similar. Even within a single area of study "bad days" could involve activities correlated to increased pollution in many different wa

I was thinking something similar. Even within a single area of study "bad days" could involve activities correlated to increased pollution in many different ways. An example that I can think of offhand: I'm way more stressed on days that neighbors are using powered yard tools (mostly mowers and blowers), which invariably also throw up lots of stuff my body and/or mind react negatively too (never been tested, but I'd be amazed if I didn't have at least an intolerance).