Air quality index of Delhi is generally Satisfactory (51–100), to Moderate (101–200) levels between March and September, and then it drastically deteriorates to Poor (201–300), Very Poor (301–400) and ...

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Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world ...

Air quality index is used by government agencies to communicate to the public how polluted the air is. Public health risks increase as the AQI rises. Eight pollutants namely particulate matter PM10, ...