Question 1:
The data here pertains to the values reported from an air quality monitoring station located at an industrial area in Hyderabad, India. There are 5 variables (date, SO2, NO2, RSPM, SPM) and 536 records. This data was collected by contacting government environmental agencies and accessing their data bank from "cpcdedb.nic.in". The SO2 values are in ppm and the NO2 values are in ppb which are the standard units in which the permissible limits and reports are defined.

Notes:
Here we have a radial graph and a complementary line chart for SO2 concentrations. We have a drop-down menu allowing selection of year of the data to be displayed. These are two different ways of looking at trends. Here we look at monthly trends. We allow the user to hover over the line (points within) to display some additional information.