export declare type Pollutant = 'co' | 'no2' | 'o3' | 'pm10' | 'pm25' | 'so2';
export declare const POLLUTANTS: Pollutant[];
/**
 * Check if the input pollutant is a recognized pollutant which we can convert
 * AQI to/from raw values
 *
 * @param pollutant - The pollutant to test
 */
export declare function isPollutant(pollutant: string): pollutant is Pollutant;
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