This Home Assistant automation is trigger through an Alexa automation.

Home-Assistant - Alexa Automation.yaml

alias: Alexa - It's stinky

trigger:

  # Trigger based on Alexa routine turning on the light.
  - platform: state
    entity_id: light.alexa_virtual
    to: 'on'

condition:

  # Check the brightness was set to 21. Why 21? To avoid clashes 20 in the range for my bathroom.
  # Brightness can only be set between 1 and 100 in a Alexa routine so we perform a calculation so the number range matches.
  - condition: template
    value_template: "{{ (state_attr('light.alexa_virtual','brightness') | int / 255 * 100) | round  == 21 }}"

action:

  # Refresh the last Alexa called
  - service: alexa_media.update_last_called

  # The delay allows the sensor to refresh
  - delay: 00:00:01
  
  # Turn off the virtual light
  - service: light.turn_off
    entity_id: light.alexa_virtual

  # Three blasts of the air freshener should be enough to remove the stink. The delays allow the switch to operate.

  - service: switch.turn_on
    data_template:
      # By removing words from alexa_media.update_last_called sensor I can determine the room and then can create the entity_id of the air freshener in that room.
      entity_id: "{{ 'switch.esph_' + states('sensor.alexa_last_used') | replace('media_player.alexa_','') | replace('esph_','') | replace('_alexa','')  | replace('_sonos','') + '_air_freshener' }}"

  - delay: 00:00:01

  - service: switch.turn_on
    data_template:
      entity_id: "{{ 'switch.esph_' + states('sensor.alexa_last_used') | replace('media_player.alexa_','') | replace('esph_','') | replace('_alexa','')  | replace('_sonos','') + '_air_freshener' }}"

  - delay: 00:00:01

  - service: switch.turn_on
    data_template:
      entity_id: "{{ 'switch.esph_' + states('sensor.alexa_last_used') | replace('media_player.alexa_','') | replace('esph_','') | replace('_alexa','')  | replace('_sonos','') + '_air_freshener' }}"