Dataset for atmospheric new particle formation measurements over the IIT Madras campus during May–June 2025

This dataset contains atmospheric measurements collected during an intensive field campaign conducted at the Indian Institute of Technology Madras, Chennai, India, from 26 May to 14 June 2025. The dataset includes aerosol chemical composition measured by a Quadrupole Aerosol Chemical Speciation Monitor (Q-ACSM), particle number size distributions measured by a Scanning Mobility Particle Sizer (SMPS), volatile organic compounds measured using PTR-ToF-MS, trace gases (NOx, SO2, O3 and NH3), and meteorological parameters from an automatic weather station. All timestamps are reported in Indian Standard Time (IST). The dataset supports the analyses presented in the associated ACP manuscript.