In all these ways the surface has been broken into fine particles.

There were fine particles of Martian sand on his fingers.

According to him, the city's residents lose about 2.5 million working days every year due to health problems associated with fine particles.

Soon, quite a cloud of fine particles was following them.

The latter are generally very efficient for collecting fine particles.

This property is due to the increased surface area of the fine particles.

Very fine particles may appear black, even when the substance itself is not.

They said that until now, no state had imposed controls on such fine particles.

In Europe, airborne fine particles due to energy consumption now kill around 300 000 people each year.

Area designations for the 1997 fine particle standard became effective in 2005.