Sarnia vs Słupsk

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Sarnia is a city in Southwestern Ontario, Canada, with a 2016 population of 71,594. It is the largest city on Lake Huron and in Lambton County. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron flows into the St. Clair River, which forms the Canada–United States border, directly across from Port Huron, Michigan. The site's natural harbour first attracted the French explorer La Salle. He named the site "The Rapids" on 23 August 1679, when he had horses and men pull his 45-ton barque Le Griffon north against the nearly four-knot current of the St. Clair River.This was the first time that a vessel other than a canoe or other oar-powered vessel had sailed into Lake Huron, and La Salle's voyage was germinal in the development of commercial shipping on the Great Lakes. Located in the natural harbour, the Sarnia port remains an important centre for lake freighters and oceangoing ships carrying cargoes of grain and petroleum products. The natural port and the salt caverns that exist in the surrounding areas, together with the oil discovered in nearby Oil Springs in 1858, led to the dramatic growth of the petroleum industry in this area.

Because Oil Springs was the first place in Canada and North America to drill commercially for oil, the knowledge that was acquired there resulted in oil drillers from Sarnia travelling the world teaching other enterprises and nations how to drill for oil.The complex of refining and chemical companies is called Chemical Valley and located south of downtown Sarnia. In 2011 the city had the highest level of particulates air pollution of any Canadian city, but it has since dropped to rank 30th in this hazard. About 60 percent of the particulate matter comes from industries and polluters in the neighbouring United States.Lake Huron is cooler than the air in summer and warmer than the air in winter; therefore, it moderates Sarnia's humid continental climate, making temperature extremes of hot and cold less evident. In the winter, Sarnia occasionally experiences lake-effect snow from Arctic air blowing across the warmer waters of Lake Huron and condensing to form snow squalls over land.

Source: Wikipedia

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Słupsk ([swupsk] (listen); German: Stolp; also known by several alternative names) is a city in the Pomeranian Voivodeship, in northern Poland, with a population of 91,007 inhabitants as of December 2018. It occupies 43.15 square kilometres (16.66 sq mi) and, according to the Central Statistical Office, Słupsk is one of the most densely populated cities in the country. Located near the Baltic Sea and on the Słupia River, the city is the administrative seat of Słupsk County and was until 1999 the capital of Słupsk Voivodeship. The neighbouring administrative districts (gminas) are Kobylnica and Gmina Słupsk. Słupsk had its origins as a Pomeranian settlement in the early Middle Ages.

In 1265 it was given town rights. By the 14th century, the town had become a centre of local administration and trade and a Hanseatic League associate. Between 1368 and 1478, it was the residence of the Dukes of Słupsk, until 1474 vassals of the Kingdom of Poland. In 1648, according to the peace treaty of Osnabrück, Stolp became part of Brandenburg-Prussia. In 1815 it was incorporated into the newly formed Prussian Province of Pomerania. After World War II, the city again became part of Poland, as it fell within the new borders determined by the Potsdam Conference.

Source: Wikipedia