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Residents upwind of the fire were ordered to evacuate and those downwind to stay in place.

South Korea is located downwind of China, and it serves as an example of how a small country can be affected by pollution from a much larger upwind neighbor.

He had noticed that deer seemed to spook if he was upwind of them.

This, he added, should include sampling upwind and downwind of the fire and analyzing how the wind may have affected debris movement.

Satellites also provide crucial information on fire locations and upwind pollution needed for forecasting where the smoke will go and how bad pollution levels will be.