Air quality index (AQI) in Delhi was “hazardous” at 334, making it the most polluted major city, according to Swiss group IQAir, which measures air quality levels based on the concentration of toxins
Air quality index (AQI) in Delhi was “hazardous” at 334, making it the most polluted major city, according to Swiss group IQAir, which measures air quality levels based on the concentration of toxins
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