Data and Code for: Critical Particle-Size Threshold for Inertial Behaviour in Thai Surface-Layer Turbulence

This archive contains selected code, processed non-restricted tables, manuscript-supporting summary outputs, and key figures supporting the manuscript "Critical Particle-Size Threshold for Inertial Behaviour in Thai Surface-Layer Turbulence: Implications for PM2.5 and Coarse-Particle Air-Quality Modelling." The study derives a physics-based critical particle-size transition threshold for Thai surface-layer turbulence and verifies the position of PM2.5 relative to that threshold using ERA5-derived turbulence estimates, site-specific moist-air properties, deterministic particle size-density analysis, Monte Carlo uncertainty propagation, volume-fraction analysis, and ERA5-surface wind validation. Large raw meteorological files are not redistributed. ERA5, NOAA/NCEI, AERONET, and public PM2.5 monitoring data should be obtained from their original providers according to their access conditions.