A writer tracks air pollution worldwide on unique tour
Beth Gardiner's world tour started with the diesel smell in her adopted hometown of London.
It took her to Delhi, Beijing and Krakow, in Poland, as well as Berlin, Los Angeles and California's San Joaquin Valley.
She was on an air pollution tour.
India has 10 of the world's 15 most polluted cities, according to the World Health Organization.
"You could see the pollution shimmering off the headlights," Gardiner says, calling south Asia "the global ground zero for air pollution."
Where would she travel for purer air?
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