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

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

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