Good article... It makes sense that a power plant will have less effect on upper atmosphere, however

"Health physicist experts agree that the greatest health concerns, affecting the largest number of people far downwind, from a nuclear power plant accident or nuclear bomb explosion(s) anywhere in the world, will likely be from that release of radioiodine that is then carried downwind for hundreds and even thousands of miles. Inhaling radioiodine will be a concern downwind..."

Most of these articles have a perspective from a person standing on the ground downwind. Is it different for us at altitude? (clouds don't always rain)