Some industries collect the particles in truck loads and sell them for use in construction materials such as concrete blocks. As the name suggests, a cyclone is a mechanism to spin waste gases, forcing the denser particles to the outside and into a collecting devise. Textile mills often use this system to remove lint from the air in manufacturing areas. As the polluted air passes through the mist, water droplets stick to the particles and make them heavy enough to fall out of the air. The air is cleaned in much the same way that a rain storm can clean pollen out of the atmosphere.
Scrubbers are one of the systems which are effective against both types of pollution.
They can also wash some types of gas pollution out of the air. The electro-static precipitator uses static electricity to give the polluting particles a strong electric charge. After receiving their charge the particles pass through a screen with the opposite electric change, they are attracted to the screen and attach themselves to it. The screen must be washed periodically to remove the particles.