This Shiny App is adopted based on the article ‘Assessing the Impact of Traffic Emissions on Fine Particulate Matter and Carbon Monoxide Levels in Hanoi through COVID-19 Social Distancing Periods’ (https://aaqr.org/articles/aaqr-21-04-oa-0081). You could use it to examine the pollutant (PM2.5,CO, SO2, NO2, O3) in Hanoi stations from 2017 - 2021 under the weather impacts including backward trajectory, wind direction, wind speed