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This study investigates the hourly concentrations of Ground-level Ozone (O3),Nitric Oxide (NO), Nitrogen Dioxide (NO2), and Oxides of Nitrogen (NOx) inambient air, along with the various meteorological parameters viz., ambienttemperature, relative humidity, wind speed, and solar radiation over one year,from August 2020 to July 2021 for an industrial and commercial site in MadhyaPradesh, a central state in India. We also analyze the chemical couplingbetween the O3 and ambient NO, NO2, and NOx at both sites during the daytime.We focus on understanding how the concentration of the oxidant OX (acombination of ozone and nitrogen dioxide) changes in relation to levels of NOx(a combination of nitrogen oxides) to determine whether the atmospheric sourcesof OX are dependent on the NOx-independent or regional contributions andNOx-dependent or local contributions. We also observe a significant positivecorrelation of O3 with ambient temperature and solar radiation but a strongnegative correlation with relative humidity for the considered period. We foundthe monthly variations of the pollutants' concentrations show a strongseasonality dependence. O3 concentration becomes highest/lowest duringsummer/monsoon for both sites. In contrast, NOx exhibits the maximum andminimum concentration during monsoon and summer for both sites. The dailyvariation shows the opposite trend for O3 and NOx. O3 reaches a peak at mid-dayaround 14: 00 Hrs when ambient temperature also goes to maximum and has theminimum value at night time due to lack of sunlight.

Understanding the chemical coupling between ground-level ozone and  oxides of nitrogen in ambient air at industrial and commercial sites in  central India