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What would lead to widely different air quality readings for the same area?

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Lately there has been so much wildfire smoke that it was unpleasant if not quite harmful to go outside. I was looking at the weather websites for a forecast to try and predict when it would be better, and noticed that the current air quality readings would be quite different between websites.

I would understand predictions being different but not the current air quality index. What could be the reason for the different reading for the same area?

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