1985 karlskoga gas leak 1985 karlskoga gas leak on 10 january 1985, a gas leak occurred at björkborn, karlskoga municipality, sweden, when a chemical plant spewed sulfuric acid gas over karlskoga. the incident forced 300 people to evacuate and injured 20 people. 1985 karlskoga gas leakkarlskogadatejanuary 10–11, 1985 (1985-01-10 – 1985-01-11)locationkarlskoga, swedencoordinates29°21′46.5″n 34°57′45.5″edeaths0non-fatal injuries20 accident on 10 january 1985, pre-7 pm local time, a gas leak was discovered at the björkborn industrial zone, located northeast of the björkborn manor, spewing sulfuric acid gas over the nearby area. the gas container stopped leaking by 3 am local time still the gas had reacted with the fog. thus, resulting in an almost opaque-like fog covering the town of karlskoga. response schools and offices were closed, all 36,000 inhabitants had to stay inside their homes, and traffic on the european route e18 stopped, all in response to the gas leak. in addition, approximately 20 people sought treatment at an emergency clinic set up at a local school, treating chest pains and coughing.