Same-route ranges contained a 10 ppb by 2 C exposure rectangle for less than 0.4% of records in four US bird samples in 1995-2024

We tested joint exposure support in 30,986 selected US bird surveys. Pooled ozone and seasonal temperature ranges contained a centered 10 ppb by 2 C rectangle for 91.7-97.6% of records in four region and period samples. The ranges for the same route contained it for only 0-0.366% of records. Later eastern absolute exposure ranges also excluded 42.7-51.9% of western pairs; separate marginal checks missed much of this gap. We used a verified published panel, convex hulls, size and range sensitivity checks, and independent numerical validation. These are finite-panel range diagnostics. They do not prove model bias or prevent identification of a shared parametric interaction. Selected coverage, short route records, coarse exposure and observation bias limit use. No biological effect is estimated. The package includes the panel, code, source hashes, record labels and reproduction instructions.

biodiversity · ozone · temperature · Breeding Bird Survey · joint exposure support · convex hull · observation bias · interpolation