> higher altitudes within the US have fewer environmental contaminants
Living in Denver, I routinely see headlines (and see with my own eyes) about how terrible the air quality is here, at certain times of the year at least. Wonder if that data controls for whether someone is in a high-altitude city or at the summit of a 14,000+ ft mountain.
Living in Denver, I routinely see headlines (and see with my own eyes) about how terrible the air quality is here, at certain times of the year at least. Wonder if that data controls for whether someone is in a high-altitude city or at the summit of a 14,000+ ft mountain.