Here are nine dirty little secrets that airlines, rental-car companies, cruise lines and others don't want you to know.
Sao Paulo, Brazil's most populous city, on Friday showcased its Expo 2020 bid at a symposium attended by delegates of the Paris-based body that will pick the winner in November.
Below is information on the current background air quality in some of North America's major cities based on data taken from http://www.airnow.gov recorded at 1:09 pm GMT on September 20.CityQualityAtlanta (Georgia) [Moderate]Chicago (Illinois) [Good]Dallas (Texas) [Good]Denver (Colorado) [Good]Miami (Florida) [Moderate]New Orleans (Louisiana) [Good]New York City (New York) [Good]San Francisco (California) N/AWashington DC (District of Columbia) GoodMontreal (Quebec) [Moderate]Toronto (Ontario) [Moderate]Vancouver (British Columbia) N/A
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