New Delhi: The Central Pollution Control Board (CPCB) stated that pollution levels in Delhi remained hazardous nearing ‘severe plus’ category on Wednesday as the air quality index rose to 448 ...

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India’s capital, New Delhi, was blanketed by toxic haze on Friday, leading some schools to close as the air quality index fell to the world’s worst level.

The U.S. Air Quality Index (AQI) is the Environmental Protection Agency’s tool for reporting outdoor air quality and health.

Delhi's air quality plummeted to hazardous levels, prompting the implementation of emergency measures. Conflicting AQI readings between Indian and international platforms sparked confusion ...

Out of the 37 monitoring stations, 32 recorded air quality in the 'severe plus' category, with AQI readings reaching as high as 480 at many locations.

What does Wisconsin's air quality index mean? A large portion of Wisconsin, including Milwaukee, Madison and Green Bay, had an AQI in the 151-200 range or in the "red" category on Monday.

While the overall AQI was at 442 at around 7 am on Wednesday, the figures in some monitoring stations of Delhi were at the ‘severe-plus’ category.

AQI is calculated by a predefined formula on the concentrations of different pollutants and then condensing the result to a single number.