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Summary

The air quality monitoring station data of Surkhet reveals notable trends in particulate matter concentrations. Specifically, the PM1 levels exhibited a pattern of higher concentrations during the Winter months compared to the Pre-monsoon season. Additionally, the Total Suspended Particles (TSP) levels showed a diurnal variation, with peak levels observed at 4 pm and the lowest levels recorded at 2 am. In 2020, a few days exceeded the National Ambient Air Quality Standards (NAAQS) guidelines out of the total 93 monitored days. The annual averages of PM1, PM2.5, PM10, and TSP levels varied between the years 2019 and 2020, indicating fluctuations in air quality parameters over time.