English Wikipedia articlesUS counties reporting good air quality days
As English Wikipedia has grown, more US counties have reported good air quality days, a correlation of 0.984 across nineteen years that connects the expansion of human knowledge to the improvement of human air with the optimistic confidence of a chart that believes information makes the world literally cleaner. The articles are written, the air clears, and both trends measure progress in their respective domains with the steady upward trajectory of things that are getting better.
English Wikipedia articles grew from about 400,000 in 2004 to over 6.7 million by 2022. Counties reporting good air quality increased as Clean Air Act enforcement and the energy transition improved atmospheric conditions. Both are smooth upward curves driven by different but parallel institutional improvements: Wikipedia by volunteer knowledge contribution, air quality by environmental regulation. The shared variable is civilizational progress—both metrics measure humanity getting better at organizing information and reducing pollution during the same two decades.
Nineteen years of Wikipedia and air quality is one of the more quietly optimistic correlations in this collection: both measure things getting better, for different reasons, at the same time. The knowledge accumulates, the air clears, and the chart records both with the hopeful precision of a coefficient that believes in progress. The article is cited. The air is breathed. Both are improving.
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Want to learn more about why correlations like “English Wikipedia articles” vs “US counties reporting good air quality days” don't prove causation? Read our guide to statistical thinking.
