As land is cleared for agriculture, for instance, the soil loses stability and more particles are blown into the atmosphere.
If more particles grow from a given amount of vapour, each has to be smaller.
The more particles there are, the more numerous the water droplets and the more reflective the cloud.
Some increases have also occurred during the recent warm days, he said, when sunlight has reacted photochemically with gases and the atmosphere to produce more particles.
Four more particles, with the right chemical make-up for interstellar dust, were found at the bottom of pits left in thin aluminium foils built into the detectors.
Mr Parr also warned that as the blaze was tackled, the more particles from the smoke plume would fall to earth.
The combination of effects from more particles drifting faster closer to the Earth enhances the nightside ring current and reduces the magnetic field on the Earth's surface.
The appropriate condition for this process occurs when the ring current possesses more particles near the equatorial plane than near the end of the field line.
It is assumed that the intervals are so small that the probability of two or more particles being emitted in a single interval is negligible.
In quantum entanglement, two or more particles are linked such that, even when they are spatially separated, a measurement on one instantly affects the others.
(Diesels emit more particles than do gasoline engines).
