export declare const MTRAirQuality: {
    readonly Unknown: 0;
    readonly Good: 1;
    readonly Fair: 2;
    readonly Moderate: 3;
    readonly Poor: 4;
    readonly VeryPoor: 5;
    readonly ExtremelyPoor: 6;
};
export type MTRAirQuality = typeof MTRAirQuality[keyof typeof MTRAirQuality];
