Quote:
Originally Posted by Flyingwedge
That sounds like my experience in the 70s, BB. High school water polo practice was in an outdoor pool on fall afternoons. In the evenings following practice, if I tried to breathe normally, I'd start to cough and had to take very shallow breaths instead. Less smog is a good thing.
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Less smog is a wonderful thing. Unfortunately smog, as we call it, can frequently occur from what is known as a "Temperature Inversion" which is a rather frequent event along many coastal areas around the world. It can also occur inland but is less common than along coastal areas where there is often an uplift in terrain a few miles back from the coastline. In simple terms air at lower levels gets trapped by a temperature inverted layer in the atmosphere. It is a bit like shutting off a ventilation system in a building.
Not much we can do about it given it is a natural phenomenon. About all we can do is reduce the amount of C0 and sulfur in the air at lower levels in locations where temperature inversions commonly occur.