00:00What is haze?
00:02Haze is not fog.
00:03Fog is made of water.
00:05Haze is made of pollution.
00:07It happens when millions of tiny particles,
00:10like smoke, dust, and chemicals, hang in the air.
00:14They scatter sunlight and make the sky look gray and blurry.
00:18The most dangerous part is called PM2.5,
00:22particles so small they can go deep into your lungs
00:25and even into your bloodstream.
00:27Where does it come from?
00:28Cars, factories, and especially wildfires and forest burning.
00:33And haze can travel.
00:35That is called transboundary haze.
00:38Right now is a perfect example.
00:40This week, wildfire smoke from Indonesia
00:43has traveled thousands of kilometers,
00:45pushing air quality indexes in parts of Southeast Asia
00:48close to 300,
00:50which is classified as acutely unhealthy,
00:53almost emergency level.
00:55That is why haze matters.
00:56It reduces visibility,
00:58but more importantly,
01:00it is a health risk.
01:01So on hazy days,
01:03stay indoors,
01:04close windows,
01:05wear an N95 mask outside,
01:07and check your local air quality index.
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