Exact(56)
The answer: minuscule particles of space debris.
Other concerns have been raised about supersmall particles of asbestos.
Particles of light – photons – are oblivious to it.
PM2.5 refers to particles of less than 2.5 micrometres.
Buried within it are very fine particles of gold.
It found abundant particles of magnetite, an iron oxide.
"It's like inhaling little particles of tar," says Prof Green.
Each tube contained around a billion particles of Ebola virus.
Blades tend to create particles of uneven size".
They could be colliding particles of dark matter.
The atmosphere contains many small particles of soluble chemical substances.
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