- do - 4.7. Hydrogen Sulphide 4.8. NOX 4.9. SOX EMISSION SOURCES 1.1. Solid Fuel Equipment to Facilities 1.2. Equipment Using Other Types of Fuel 2.1. Facilities Used for the Heating of Metal Other Thank Cold Blast Foundry Cupola 2.2. Facilities Discharging Dust Containing Asbestos and Free ...