HMCharacteristicValueAirQuality.excellent The air quality is excellent. Declarationcase excellent See AlsoAir QualityHMCharacteristicValueAirQuality.unknownHMCharacteristicValueAirQuality.goodHMCharacteristicValueAirQuality.fairHMCharacteristicValueAirQuality.inferiorHMCharacteristicValueAirQuality.poor