Question

how can factory owners reduce air pollution

Answer 1

Factories can use a number of air pollution control technologies such as Electrostatic precipitators and bag houses or filters for PM control, low NOx burners, staged combustion, fuel gas recirculation, and both selective and non-selective catalytic reduction to reduce emissions from combustion.

Answer 2

There are methods like using 1.scrubers which filter the air in the industry itself .
2.electron nulifiers: which makes the charge of the dust to neutral making it separated by use of multiple devices.