convert_to_imeca        Convert pollution values to IMECA
convert_to_index        Convert a pollutant concentration to its air
                        quality category
download_24hr_average   Download archives of the 24 hour averages of
                        pollutants
download_deposition     Download Acid Rain Measurements Archives
download_lead           Download Lead Pollution Archives
download_meteorological
                        Download Meteorological Data Archives
download_pollution      Download Pollution Archives
download_pressure       Download Atmospheric Pressure Archives
download_radiation      Download Ultraviolet Radiation Archives
get_latest_imeca        Get the latest pollution values for each
                        station
get_station_data        Download pollution data by station
get_station_imeca       Download pollution data by station in IMECAs
get_station_month_data
                        Download monthly pollution data
get_zone_imeca          Download pollution data by zone in IMECAs
idw360                  Inverse Distance Weighting with Directional
                        Data
stations                Pollution measuring stations in Mexico City
zones                   Pollution zones in Mexico City
