Pollen Sensor for Germany based on DWD (Deutscher Wetter Dienst)

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Even though the topic is quite old, I wanted to share my slightly improved sensor since I managed to solve the issue of dealing with the array and only picking the item for the partregion_id I’m interested in (by using JSONPath) and not using an unreliable array index which can change.

sensor:
  # DWD Pollen, see: https://opendata.dwd.de/climate_environment/health/alerts/Beschreibung_pollen_s31fg.pdf
  # (partregion_id=111 for "Oberrhein und unteres Neckartal")
  - platform: rest
    scan_interval: 3600
    name: "DWD Pollen"
    resource: https://opendata.dwd.de/climate_environment/health/alerts/s31fg.json
    json_attributes_path: "$..content[?(@.partregion_id==111)].Pollen"
    json_attributes:
      - Erle
      - Beifuss
      - Ambrosia
      - Birke
      - Esche
      - Hasel
      - Graeser
      - Roggen
    value_template: "{{ value_json.last_update }}"
  - platform: template
    sensors:
      dwd_pollen_erle:
        icon_template: "mdi:tree-outline"
        friendly_name: "Erle"
        value_template: >-
          {% set dwd_state = state_attr('sensor.dwd_pollen', 'Erle')['today'] %}
          {% if dwd_state == "3" %}6{% elif dwd_state == "2-3"%}5{% elif dwd_state == "2"%}4{% elif dwd_state == "1-2"%}3{% elif dwd_state == "1"%}2{% elif dwd_state == "0-1"%}1{% else %}0{% endif %}
        attribute_templates:
          today: >-
            {% set dwd_state = state_attr('sensor.dwd_pollen', 'Erle')['today'] %}
            {% if dwd_state == "3" %}6{% elif dwd_state == "2-3"%}5{% elif dwd_state == "2"%}4{% elif dwd_state == "1-2"%}3{% elif dwd_state == "1"%}2{% elif dwd_state == "0-1"%}1{% else %}0{% endif %}
          tomorrow: >-
            {% set dwd_state = state_attr('sensor.dwd_pollen', 'Erle')['tomorrow'] %}
            {% if dwd_state == "3" %}6{% elif dwd_state == "2-3"%}5{% elif dwd_state == "2"%}4{% elif dwd_state == "1-2"%}3{% elif dwd_state == "1"%}2{% elif dwd_state == "0-1"%}1{% else %}0{% endif %}

You have to replace the 111 in the json_attributes_path of the first REST sensor with your partregion_id. This REST sensor then has one attribute for each pollen type. The second sensor (template type) is just an example, you have to repeat this for every pollen type, it’s sadly quite repetitive. Its value is a number between 0 and 6 (indicating the intensity today) and the attributes contain todays’ and tomorrows’ intensity. So you’re quite flexible with using it in a Lovelace card.

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