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Will elevation cause breathing problems in Yellowstone? Yosemite?

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We would like to plan a trip with my son's family to Yellowstone or to Yosemite. However, my son has a lung condition that makes higher altitudes very difficult for him. (We live in Tucson, which is less than 3,000 ft. elevation.) We're not concerned about hiking--just driving or riding a shuttle to see the sights and relaxing somewhere nearby.
Can you tell us of any experiences you may have had with altitude in either park, and if you have a recommendation?

Thanks.

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