The Greenpeace report came on a day the national capital recorded 'poor' air quality for the second consecutive day. The NGO claimed high level of PM10 may "reduce" the quality of football played during the tournament.
According to the report, in October 2016, the average levels of PM10 - coarse particulates measuring less than 10 microns in diameter - were 304 and 100 microgrammes per cubic metre (ug/m3) in Delhi and Mumbai.
Delhi will co-host the tournament with Mumbai, Kochi, Margao (Goa), Guwahati and Kolkata.
"PM10 level on October 6 last year in Delhi was 234g/m3, and 320g/m3 on October 16 (when Delhi hosts the last tournament match this year).
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"These values are over 4 times and 6 times above the World Health Organisation's limits of 50g/m3 over a 24-hour period, and over 2 and 3 times above India's PM10 standards of 100g/m3 (over a 24 hour period)," a Greenpeace India statement said.
Greenpeace executive Sunil Dahiya said such levels of air pollution could also reduce the quality of football played at the tournament.
Last month, in a series of meetings the Supreme Court- monitored Environment Pollution (Prevention and Control) Authority had expressed concern over a possible spike in pollution levels during the world cup and had directed concerned agencies to take preventive measures.