Checks out so far.

“Using an instrumental-variable design for Chinese scholars, the study estimated that a 1 μg m−3 increase in annual PM2.5 caused a 0.23% decline in academic publications, with larger effects during heavy-pollution years.”

3 of 4 review checks done · 1 counted · 2 by the author only

Supported · 0.9908 under ledger-default@0.3.0 at snapshot 27745 · review checks 1 of 4 · provisional until audited. The number is model-conditional, not a share of truth.