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| Last Updated:23/01/2020

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Ahmedabad's air 2nd worst, Faridabad tops the list


 Times of India, New Delhi, May 4, 2015


AHMEDABAD: Sunday proved to be an exception, nationally, on the Central Pollution Control Board (CPCB) daily air quality index (AQI) list. Ahmedabad displaced Delhi in the rank to become the second city with a poor ambient air quality in the country.


The AQI index defined the city's air quality to be "very poor" along with Faridabad. The AQI score for Ahmedabad was 304, while that of Faridabad was 341. Delhi on the other had an AQI score of 259 and was rated "poor" by CPCB. Since the last two days the CPCB has been releasing a daily air quality bulletin for 11 cities across the country.


The AQI is decided on ambient concentration values of air pollutants and their likely health impacts which are commonly called health break points. The pollution parameters whose concentration is measured in ambient air include particulate matter that are of size 2.5 microns (PM 2.5), PM 10, nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia and lead. The pollution parameter is measured over a period of 24 hours and the data is revealed by the CPCB the following day.