http://www.calgary.ca/UEP/ESM/Pages/State-of-the-Environment/Air/Air-quality.aspx
I’ll add here for the benefit of everyone’s understanding by way of direct experience.
AVERAGE MEANS NOTHING!
WHERE AIR STANDARD STILL FOR LONG PERIODS OF TIME AND STAGNATES, THIS IS THE REAL TRUE DANGER TO MENTAL & PHYSICAL PROCESSES BECOME OF AN ACCUMULATION AND BUILDUP OF TOXINS!
ALL LOW LYING ARE AND VALLEYS ARE AT GREATER RISK !
WHERE LOW CLOUD COVER CREATES A DISTINCT BOUNDARY BETWEEN GROUND AND SKY THAT ACTS AS A CONTAINMENT VESSEL.
AS WELL AS CONFINED INTERIOR SPACES!
NEED I SAY MORE???
Live~NRGY 
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