Principle: If the dust particles in the air are charged, they will be attracted by the electrodes with different charges, and thus be adsorbed on this electrode.
Use plastic beverage bottles, cut off the bottle mouth, leaving only the straight part. Wrap the thin copper wire around the outside of the straight pipe with a spacing of 1 or 2 cm. Insert another straight copper wire into the center of the bottom of the straight pipe. These two copper wires are used as two electrodes. Turn the straight tube upside down (bottom up) and put it on the table. Put some cigarettes in it (you can light some scraps of paper and cover it with the straight tube). Connect an electrostatic generator (common in physics laboratories) to two electrodes, shake the electrostatic generator and charge the two electrodes, and you will see the smoke disappear quickly.
In this way, the smoke and dust in the factory chimney can be eliminated.