pollucheck v1.0: A package to explore open-source air pollution data

`pollucheck` helps to analyze and visualize open-source air pollution data available. An example data set is already loaded to help you walk through all the features of the app. If you need help with downloading your own, check the README file on GitHub. This app can process all parameters except wind direction which when downloaded at 1 hour is processed correctly. Wind direction at any other time resolution (e.g. - daily average) is not averaged correctly as it is a vector and cannot be averaged using simple arithmetic mean.