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Of interest to folks looking at this post -- Chris Said has a deeper dive on US air quality metrics and their provenance, https://chris-said.io/2023/06/19/the-a

Of interest to folks looking at this post -- Chris Said has a deeper dive on US air quality metrics and their provenance, https://chris-said.io/2023/06/19/the-air-quality-index-doesnt-make-any-sense/ https://chris-said.io/2023/06/19/the-air-quality-index-doesn.... The attempt to make things easy to interpret using a nice relative scale ends up in the end make them very opaque to interpret the number itself in any meaningful way.

mrob 3y ago
The "inexplicable" addition of 0.4 to the round multiples of 50 looks like it's there to stop people claiming that limits apply after rounding to the nearest fifty. If the threshold is 50, people might claim 74 is acceptable because it rounds to 50. If the threshold is 50.4 this is obviously false.