D．High concentrations of pollutants in the air.

　　解析：选D。细节理解题。根据第四段最后一句“In addition，most cities measure the concentrations of pollutants in the air and report the results to the public.”可知，空气中高浓度的污染物能较准确地表明空气质量差。故选D。

　　D

　　A campaign is being launched to encourage children to give up 30 minutes of screen time a day to head for the great outdoors to experience the wonders of the wilderness.

　　The newly formed Wild Network—a cooperation of nearly 400 organizations—is attempting to attract youngsters away from television and computer screen and into fields，woods and parks.Organizers say it is the UK’s biggest ever campaign to reconnect children with nature and outdoor play，and claim it could help improve fitness，mental alertness and general happiness.

　　A documentary film，Project Wild Thing，will be a sign of the launch at more than 50 cinemas across the UK from Friday.It looks at the increasingly weak link between children and nature.

　　Members of the network include the National Trust，RSPB，Play England and the NHS sustainable development unit.Andy Simpson，chairman of the Wild Network，said，“The tragic truth is that kids have lost touch with nature and the outdoors in just one generation.Time spent outdoors is down，roaming ranges have fallen drastically，activity levels are declining and the ability to identify common species has been lost.”

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