text: """Define AirVisual constants."""
  from datetime import timedelta
  
  DOMAIN = "airvisual"
  
  CONF_CITY = "city"
  CONF_COUNTRY = "country"
  
  DATA_CLIENT = "client"
  
  DEFAULT_SCAN_INTERVAL = timedelta(minutes=10)
  
  TOPIC_UPDATE = f"{DOMAIN}_update"
  