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Message: [QUOTE="johnny canoe, post: 113298, member: 4686"] Of course this is natural air pollution, wildfires started by lightning strikes. Back in the day the grasslands here would always be catching fire in the hot summers from the lightning strikes. That is how the name Blackfoot was given to the Siksika people, from their feet being blackened walking over the ashes of the prairie fires. However we are a city of over a million people so there is the man made pollution of course as in every populated centre. [/QUOTE]