The smaller sorts of airborne particles are alone thought to cause 380,000 premature deaths in Europe every year.
Burning peat and vegetation produces smoke rich in tiny airborne particles.
The southwest Iranian city of Ahvaz walked away with the unfortunate distinction of having the highest measured level of airborne particles smaller than 10 micrometers.
Young children's minds may be especially sensitive to tiny airborne particles spewed by traffic, according to Shakira Franco Suglia of the Harvard School of Public Health in Boston and her colleagues.
Even in fair weather, a very small electric field is present in Earth's atmosphere. This field can charge airborne particles and the edges of clouds, Harrison said.
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