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@nazokiyoubinbou @inthehands @violetblue The key part is: the baseline is the 10th percentile of the past 12 months of data.

When comparing to the previous year, using the 10th percentile is a good approximation to the lowest amount that's reasonable to find. Especially for data that's as flaky as wastewater. It's hard to measure viral load in wastewater.

So, this year's baseline is last year's 10th percentile. Seems reasonable.