code: def ozone_around_coords(self, lat, lon, start=None, interval=None):
          
          geo.assert_is_lon(lon)
          geo.assert_is_lat(lat)
          params = {'lon': lon, 'lat': lat, 'start': start, 'interval': interval}
          json_data = self._pollapi.get_o3(params)
          ozone = self._parsers['ozone'].parse_JSON(json_data)
          if interval is None:
              interval = 'year'
              ozone._interval = interval
          return ozone
docs: Queries the OWM Weather API for Ozone (O3) value in Dobson Units sampled in
          the surroundings of the provided geocoordinates and in the specified
          time interval. An *Ozone* object instance is returned, encapsulating a
          *Location* object and the UV intensity value.
          If `start` is not provided, the latest available ozone value is
          retrieved.
          If `start` is provided but `interval` is not, then `interval` defaults
          to the maximum extent, which is: `year`
  
          :param lat: the location's latitude, must be between -90.0 and 90.0
          :type lat: int/float
          :param lon: the location's longitude, must be between -180.0 and 180.0
          :type lon: int/float
          :param start: the object conveying the start value of the search time
              window start (defaults to ``None``). If not provided, the latest
              available Ozone value is retrieved
          :type start: int, ``datetime.datetime`` or ISO8601-formatted
              string
          :param interval: the length of the search time window starting at
             `start` (defaults to ``None``). If not provided, 'year' is used
          :type interval: str among: 'minute', 'hour', 'day', 'month, 'year'
          :return: an *Ozone* instance or ``None`` if data is not available
          :raises: *ParseResponseException* when OWM Weather API responses' data
              cannot be parsed, *APICallException* when OWM Weather API can not be
              reached, *ValueError* for wrong input values