* UA Flight 82 departed on Sunday - United website
* Flights were canceled on Friday, Saturday - FlightRadar24
* New Delhi among world's 10 most polluted cities - consultant (Changes slug, dateline, recasts, adds risk consultant comment)
NEW YORK/SINGAPORE, Nov 13 (Reuters) - United Airlines on Sunday resumed flights from Newark, New Jersey to New Delhi, India, according to the airline's website, after suspending the service temporarily over concerns about poor air quality in the Indian capital.
UA Flight 82 had been canceled on Friday and Saturday, data from flight tracking website FlightRadar24 showed, while the airline's website said it had waiver policies in place for passengers traveling to, from or through Delhi until Monday.
A United spokesman had earlier said that flights had been suspended temporarily over poor air quality concerns. He said the third-largest U.S carrier was monitoring advisories as the New Delhi region remains under a public health emergency, and was coordinating with respective government agencies.
Last week, New Delhi declared a pollution emergency as toxic smog hung over the city for days, with tourism operators reporting cancellation of bookings for the Christmas holidays.
United could not be reached later to confirm UA82 had resumed operations but the United website showed it had departed at 21:07 EST (02:07 GMT), as did the Newark airport's website.
U.S. rivals Delta Air Lines Inc and American Airlines Group Inc said they do not operate flights to New Delhi, while several Asian airlines contacted by Reuters said they had not canceled flights.
Verisk Maplecroft, a risk consultancy, says India has the worst air quality out of a list of 198 countries it measures, and that New Delhi ranks among the world's top 10 most polluted cities with many urban areas around the capital also among those with the worst air quality.
"At the national level, India tops the index rankings (i.e. the country with the worst air quality), followed by Bangladesh and Thailand," said Richard Hewston, Verisk Maplecroft's global head of environment and climate change.
The company's Air Quality Index assesses the atmospheric concentrations of fine particulate matter smaller than 2.5 micrometers, known as PM 2.5.
A U.S. embassy measure of PM 2.5 showed a reading of 481 in New Delhi on Monday morning, local time. The outer limit of "good" air is 50.
(Reporting by Catherine Ngai in New York and Jamie Freed and Henning Gloystein in Singapore; editing by Diane Craft and Himani Sarkar)