Pollen/Allergy Sensor

Thanks @fantangelo this is great!

This is what I ended up with, working perfectly.

# weather network environment data
sensor:
  - platform: rest
    resource: https://www.theweathernetwork.com/api/data/XXXXXXXX
    name: weather_network
    json_attributes:
      - obs
      - swo
    value_template: 'OK'
    scan_interval:
      minutes: 160

  - platform: template
    sensors:
      weather_network_pollen_index:
        value_template: '{{ states.sensor.weather_network.attributes["obs"]["pollen_index"] }}'
        friendly_name: 'Pollen Index'
      weather_network_pollen_name:
        value_template: '{{ states.sensor.weather_network.attributes["obs"]["pollen_name"] }}'
        friendly_name: 'Pollen Risk Type'
      weather_network_uv_index:
        value_template: '{{ states.sensor.weather_network.attributes["obs"]["uv_label"] }}'
        friendly_name: 'UV Index'
      weather_network_air_quality:
        value_template: '{{ states.sensor.weather_network.attributes["obs"]["aq_level"] }}'
        friendly_name: 'Air Quality'
      weather_network_temperature:
        value_template: '{{ states.sensor.weather_network.attributes["obs"]["t"] }}'
        friendly_name: 'Temperature (Weather Network)'
        device_class: temperature
        unit_of_measurement: '°C'
      weather_network_swo_level:
        value_template: '{{ states.sensor.weather_network.attributes["swo"]["swo_level"] }}'
        friendly_name: 'Severe Weather Risk Level'
      weather_network_swo_type:
        value_template: '{{ states.sensor.weather_network.attributes["swo"]["swo_type"] }}'
        friendly_name: 'Severe Weather Risk Type'
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