A study pointing that the pollution levels in New Delhi is worse than that of Beijing may have been quoting the data from the worst period of the year but the air quality in Indian cities is progressively getting worse, United Nations climate change chief Rajendra Pachauri said on Tuesday.

“We also have to allow the fact that there are variations in the composition of PM 2.5 in the atmosphere which varies from season to season. It may very well be the study they are quoting is that of the worst period during the year,” he told the media in Beijing at a pre-launch function of the report on the India-China Low Carbon Study.

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