The blast waves were still blowing thick smoke and dust into the atmosphere, and the sky was gradually dimming. Even at night, the starlight and moonlight had disappeared.
Roy knew that this was due to a massive amount of dust gathering in the atmosphere. This dust would stay in the atmosphere for the next few months and block all light from the sun. During this time, because there was no sunlight, the plants on the ground would wither and die, causing further destruction to the ecosystem.
The temperature of the entire Earth would welcome a huge drop. Perhaps when the snow fell, the dust in the atmosphere would slowly fall to the ground with the snow, but this process was extremely slow. Until the sun could shine on the Earth again, the nuclear winter would continue.