I can't help but notice the poor air quality here on the US east coast today and wonder if any of the link can be explained by the exposure to pollutants due to commuting. It took me years to piece together that my chronic sinus issues and occasional heart palpitations were connected. Too much post nasal drip would end up filling my lungs with phlegm, leading to symptoms not all that different than COPD. It's not hard to imagine someone in poorer health having the same reaction in closer to real time on a Monday morning.