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Rickshaw Driver

Speeding through Dacca, Bangladesh, on foot should keep this rickshaw driver's lungs in top shape, but pollution is a heavy counterweight. Surgical masks like these are now commonplace in Asia, where environmental laws are often lax if they exist at all. Dacca's air is burdened by vehicle emissions; air quality improved after the advent of unleaded gasoline, but toxins such as carbon monoxide persist.

Photograph by Justin Guariglia