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Is the Air Quality Index enough? What the AQI can — and can't — tell you about how healthy the atmosphere is.
It’s a scale of 0 to 500, with the higher number indicating the air is potentially more dangerous to one’s health. An AQI value of 50 ... and time-intensive, meaning it takes days or weeks ...
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High AQI levels: What does it mean and how to protect yourself
A more accurate way of measuring this pollution would be through its AQI, a tool that measures the quality of air at various levels. A reading of 450-500 is what Delhi is recording at the moment ...