The city industry is dominated by food processing, textile, printing and metal processing. In 2012, it accounted for 30% of the city GDP. Most of the industrial areas are located in Gazi Baba municipality, on the major routes and rail lines to Belgrade and Thessaloniki. Notably, the ArcelorMittal and Makstil steel plants are located there, and also the Skopje Brewery. Other zones are located between Aerodrom and Kisela Voda, along the railway to Greece. These zones comprise Alkaloid Skopje (pharmaceuticals), Rade Končar (electrical supplies), Imperial Tobacco, and Ohis (fertilizers). Two special economic zones also exist, around the airport and the Okta refinery. They have attracted several foreign companies, such as Johnson Controls, Johnson Matthey and Van Hool.