Aerosol physical characterization: A review on the current state of aerosol documentary standards and calibration strategies
Bibliographic record
Abstract
Aerosols have a wide-ranging impact on the climate, air quality, human health, and agriculture. Despite the ongoing advances in aerosol measurement science and technology, the uncertainties in quantifying aerosol physical properties remain significant in many applications. The accurate characterization of airborne particles - including number and mass concentration, size distribution and light absorption - is critical for understanding their behavior in the atmosphere and environmental fate. We delve into the physical characterization of aerosols, highlighting the measurement and documentary standards that underpin measurement traceability and enable comparison of data collected by instruments based on measurement principles at different times or locations. In particle metrology, recent advances have led to sophisticated primary measurement standards, with relative expanded measurement uncertainties down to 1.1 % (coverage factor k = 2; 95 % confidence interval). These standards enable time- and cost-effective instrument calibration to support research, industry, and legislation. We discuss documentary standards and regulations related to air quality and control of particle emissions from vehicles, aviation, shipping, and stationary sources, with the aim to increase awareness of these documents and underline differences in measurement protocols in different sub-fields of aerosol sciences. Importantly, we emphasize the need for further harmonization of measurement procedures, providing specific examples and making suggestions towards this goal. This review, with its comprehensive coverage of aerosol measurement and documentary standards across different sub-disciplines, can serve as a reliable guide for scientists and regulators interested in improving the accuracy of their measurements. • Comprehensive coverage of aerosol documentary and measurement standards across different sub-disciplines of aerosol science. • Paths to measurement traceability for different aerosol metrics. • Overview of state-of-the-art laboratory set-ups for aerosol physical characterization. • Summary of best measurement uncertainties attained in particle metrology.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.007 | 0.009 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.006 | 0.005 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.004 | 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; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".