This Zenodo record contains the processed data used in the manuscript titled “Physico-Chemical properties of aerosols during fog-haze spell in Delhi: Observational Insights from WiFEX Field Campaign.” The dataset supports the analysis of aerosol-fog interactions during the 1-11 January 2023 winter fog-haze spell over Delhi, India, observed under the Winter Fog Experiment (WiFEX). The deposited files include processed time-series data used for event-based, phase-wise, and compared dry-window analyses presented in the manuscript. These files contain the variables used to evaluate the evolution of non-refractory submicron particulate matter (NR-PM1), organic aerosol components, inorganic aerosol species, and supporting meteorological parameters. The dataset is intended to support transparency, reproducibility, and re-use of the processed results underlying the figures, tables, and interpretations presented in the manuscript. A README file is included to describe file contents, variable definitions, time format, and general usage notes. This record contains processed research data only. Instrument-specific proprietary analysis tools used upstream in the workflow, including Igor-based AMS analysis utilities, are not redistributed here.