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Wind currents from Asia and India can carry ozone smog and pollution thousands of miles away to the southern Atlantic Ocean.

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During certain seasons researchers believe the build-up of ozone smog is caused by pollutants being carried on a train track of air current from the Indian Ocean.

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NASA satellites and weather balloons are tracking wind currents, fires and lightning strikes to identify large areas of ozone smog.

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Scientists using NASA's Total Ozone Mapping Spectrometer satellite instrument also identified areas of ozone smog moving high over Africa.

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By monitoring the flow of pollutants, NASA seeks to develop scientific understanding of how Earth copes with natural and man-made hazards.