Surviving Great Smoky

摘要

To summer hikers and tourists it may look pretty. But America's Great Smoky Mountains National Park, shrouded in a hazy cloak of ozone and sulphur dioxide, may be a veritable hell for its rich spectrum of plant life—as well as for visitors who suffer from asthma. Ironically, it is the notoriously high pollution levels in this swathe of land straddling Tennessee and North Carolina that create the beautiful pastel-coloured sunsets that draw in the sightseers.