Hydrochloric Acid can be emitted from many industrial processes, where it is either used in that form, or generated from the process.
HCl will usually be in fine, sub-micron mist form.
The gas comes from the process or vapours are drawn to the chimney by a suction fan.
In a Titanium Dioxide Chloride process there are emissions of TiO2 dust along with HCl, and after one or more gas scrubbing stages (see also section 18.2), fibre bed mist eliminators are installed to capture the HCl mist
Air Pollution
