Polychlorinated Naphthalenes in the Atmosphere
Bibliographic record
Abstract
Polychlorinated naphthalenes (PCNs) are a class of industrial chemicals that are receiving renewed interest due to their abundance in the atmosphere and dioxin-like toxicity. Several recent measurements of their atmospheric burdens show that ΣPCN is 60-150 pg m-3 at urban locations and lower at rural and remote sites. Typically, ΣPCN is 20-50% of ΣPCB (polychlorinated biphenyls) and the toxicity contribution (measured as TCDD toxic equivalents, TEQs) is of a similar magnitude. Air parcel back trajectories show that elevated PCN burdens at remote arctic locations can be attributed to air masses that stem from land-based sources in the U.K. and Europe. The long-range atmospheric transport of PCNs is largely governed by particle-gas partitioning. The particle-associated fraction of PCNs is described using a simple model that utilizes the octanol-air partition coefficient (KOA).
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.017 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".