Dataset for "Sub-Diurnal Variability of Urban NOx Isotopes: Keeling Plot and δ15N– Oxidative ratio Analysis Reveal Hidden Combustion Sources"

This dataset supports the study “Sub-Diurnal Variability of Urban NOx Isotopes: Keeling Plot and δ15N–Oxidative Ratio Analysis Reveal Hidden Combustion Sources” by Kamezaki et al. The dataset contains time-resolved measurements of NOx, CO2, and O2 concentrations, along with δ15N(NOx) values, observed at the AIST (National Institute of Advanced Industrial Science and Technology) site in Tsukuba, Japan. Observation periods (Japan Standard Time, JST): - February 1–2, 2024 - March 13–14, 2024 - October 29–30, 2024