Code and data for: Does metro rail operation reduce corridor NO2? Satellite evidence from Dhaka

Code and data for the article “Does metro rail operation reduce corridor NO2? Satellite evidence from Dhaka” (Islam, Fabia, Rihan and Mimi; submitted). The study evaluates whether passenger operation of Dhaka’s MRT Line-6 (northern segment opened 29 December 2022, southern segment 5 November 2023) changed tropospheric NO2 along the corridor, using native Sentinel-5P TROPOMI Level-2 pixels (official reprocessing v2.4.0 followed by OFFL v2.5+), a native-footprint audit, a rule-based control inventory, and a staggered event study with placebo-calibrated, equivalence-framed inference.

Contents: code.zip – the scripted pipeline (redesign/01-16), document builders, README with run order, pinned environment (environment.yml) and lock files, data dictionary (DATA_DICTIONARY.md) and licence. data_native_pixels_RPRO.zip – every valid native TROPOMI pixel intersecting each spatial unit, one file per month (July 2018-December 2025), plus station pixels. data_inputs_and_panels.zip – unit geometries (GeoJSON), rule-based candidate inventory, balance covariates, OpenStreetMap major-road extract, monthly panels, processor audit, Google Earth Engine daily sensitivity series and the original line, station and control shapefiles. results_tables_figures.zip – supplementary tables S1-S19, all figures, event-study, placebo and sensitivity outputs, the key-numbers file and the manuscript number audits.

Reproduction: run the scripts in redesign/ in numerical order as listed in redesign/README.md. Google Earth Engine and NASA Earthdata credentials are required only for the two download steps (02 and 05). Data sources: Contains modified Copernicus Sentinel data (2018-2025), distributed by the NASA GES DISC; ESA WorldCover 2020; WorldPop 2020; VIIRS night-time lights; road network (c) OpenStreetMap contributors, available under the Open Database License (ODbL). Code is released under the MIT licence.