Here's a unscientific sample of today's Yellow Dust hovering over Mokpo, taken from Yudal-san. You can compare it with a 'clear' day taken during May of last year.
The Gwangju station's reading for this day had an average of 100 micrograms which is the first benchmark and is considered relatively safe. To understand the notion of relatively safe you should compare the above to the The Military Monitoring Station Info Card's sample of the toxic level of +1000 micrograms:
Wednesday, March 19, 2008
Today's Yellow Dust in Mokpo
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