Optional. Contains the air quality information for each hour in the
requested range. For example, if the request is for 48 hours of history
there will be 48 elements of hourly info.
Optional. The ISO_3166-1 alpha-2 code of the country/region corresponding
to the location provided in the request. This field might be omitted from
the response if the location provided in the request resides in a disputed
territory.