MTRNitrogenDioxideConcentrationMeasurementFeature Declarationstruct MTRNitrogenDioxideConcentrationMeasurementFeature TopicsInitializersinit(rawValue:)Type PropertiesaverageMeasurementcriticalLevellevelIndicationmediumLevelnumericMeasurementpeakMeasurement RelationshipsConforms ToBitwiseCopyableEquatableExpressibleByArrayLiteralOptionSetRawRepresentableSendableSendableMetatypeSetAlgebra