Yesterday, there was moderate yellow sand in the afternoon. It peaked in the evening at an “unhealthy” level. I’ve been reading about the effects on health on prolonged exposure to yellow sand and they aren’t to be taken lightly. If you live in Korea, it would be wise to wear a mask when you go outside and take a shower when you get home. I remember that in the Philippines, we were asked to carry wet hankies with us after the Mt. Pinatubo explosion, so we could protect ourselves from the ash emitted by the volcano. Yellow sand contains a lot of harmful elements from sulfur to asbestos.