Where does dust come from? That's Tomorrow Today's viewer question from Sophie Li in the US.
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We do it all the time without giving it any thought – breathing. We inhale oxygen and exhale carbon dioxide. But air doesn't only contain the gases we need but also harmful particulate matter.
Hundreds of flights have been canceled after a thick shroud of sand and dust descended on the Chinese capital. Pollution has reached "dangerous" levels.
Microscopic particles of plastic are entering the atmosphere and being dumped by snow, new research found. The study raises questions about the amount of microplastics humans and wildlife are inhaling.
Can breathing masks protect you against the biting smoke of the bush fires in Australia or the ash rain in the Philippines? How does the body react to the particles - and who is particularly at risk?
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