Common household soaps and detergents claiming to have the scent of “mountain air” or “fresh pine” might seem a far-flung marketing ploy, though they don’t need to be. Teaming with Yellowstone Forever, the official nonprofit partner of Yellowstone National Park, the beauty and fragrance makers Caswell-Massey have produced a collection of oils and tonics that are directly and scientifically sampled at the source. Launched this year, with more to come in 2020, the special releases were developed over the course of five years with fragrance scientists at IFF, who were granted a scientific research permit to work with Yellowstone’s botanists to carefully study and preserve rare and living flora that are unique to the park.