Swirling sand is causing big problems in parts of Asia.
China, Japan and South Korea have been affected by the "yellow dust" storms caused by sand from the Gobi desert which gets whipped away by high winds.
When it passes through industrial areas, it can pick up poisonous stuff that's being pumped out by factories into the atmosphere.
People in the affected areas are being warned to wear face masks and headscarves to protect themselves.
Parents are being urged to keep their kids inside, and many schools have been shut while the yellow dust is at its worst.
Officials say the storms are now calming down.
Common
They're common in these countries from February to May.
People are getting more worried about them because China has many more factories than it used to, so there's more chance of the sand mixing in with poisonous dust.
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