Early on, a keyword that looked like one of the biggest numbers in the whole plan turned out to be an entire product family, not one keyword. The first pull said 165,000 a month. The real figure is nearer 3,700–18,000. A separate finding turned out to be an artifact too. It said that searches for a smoke air purifier peak in the heating season, and it rested on a seasonality array carrying only four distinct values. The five-year trend curve peaks in fire season instead. Roughly twenty claims like these got caught and retracted before anything shipped. This page is what happens when one gets caught after.
What gets corrected
This log corrects anything published on the site that turns out wrong: a number, a threshold, an attribution, a date. A reading, a quote, or a stated figure that disagrees with a reader’s own measurement is worth reporting. Readers running their own gear — PurpleAir, AirGradient, a Home Assistant dashboard — catch most of these. That habit shows up in roughly 150 posts of the material reviewed.
It’s exactly the kind of thing this log exists to record. They compare our number against theirs. We’d rather they find a dated correction than a quiet edit.
How a correction is marked
Every correction gets a date. It stays visible. Nothing gets edited away quietly, and nothing gets folded into the original text as if it always read that way. A corrected page carries a dated link back to this log. A reader lands on the history, not a clean surface pretending nothing changed.
The standing rule
The standing rule: an admitted gap beats a confident invention. Two live examples show it. Three states — Washington, Minnesota, Wisconsin — have a documented daycare air-quality threshold in the material reviewed, and no other state gets named. A city’s monitoring station, and its distance from the metro center, stay unlabeled until the data pipeline confirms them. That’s preferred over shipping a plausible-sounding number nobody checked.
A fourth, Utah, has no published rule in anything found so far, so none is stated for it. Both are gaps said out loud, not numbers guessed at.
Report one
If a number here doesn’t match your own reading, flag it. If a quote looks wrong or a threshold reads stale, flag that too. This log is where it gets fixed in public, not quietly.
This page ships with nothing listed below yet. An empty log means no correction has run yet, not that none ever will. Read how we measure for the mechanics behind the numbers, or what this project is and isn’t for the rest.