enum AirQualityEnumThe quality of the analyzed air.
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                  The air quality is unknown. DeclarationSwift case unknown
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                  The air quality is good. DeclarationSwift case good
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                  The air quality is fair. DeclarationSwift case fair
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                  The air quality is moderate. DeclarationSwift case moderate
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                  The air quality is poor. DeclarationSwift case poor
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                  The air quality is very poor. DeclarationSwift case veryPoor
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                  The air quality is extremely poor. DeclarationSwift case extremelyPoor
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                  Creates a new instance with the specified raw value. If there is no value of the type that corresponds with the specified raw value, this initializer returns nil. For example:enum PaperSize: String { case A4, A5, Letter, Legal } print(PaperSize(rawValue: "Legal")) // Prints "Optional(PaperSize.Legal)" print(PaperSize(rawValue: "Tabloid")) // Prints "nil"DeclarationSwift init?(rawValue: UInt64)ParametersrawValueThe raw value to use for the new instance.