Ludhiana vs Sarnia

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Ludhiana is a city and a municipal corporation in Ludhiana district in the Indian state of Punjab. Ludhiana is Punjab's largest city and the largest city north of Delhi. The city has an area of 159 km2 (61 sq mi) and an estimated population of 1,618,879 as of the 2011 census. The city stands on the Sutlej River's old bank, 13 kilometres (8.1 mi) south of its present course. It is an industrial center of northern India, often referred to as India's Manchester by BBC.

Ludhiana is among the list of smart cities that will be developed by government of India and has been ranked as the easiest city in India for business according to the World Bank. Ludhiana is 107 kilometres (66 mi) west of the state capital, Chandigarh, and is centrally located on National Highway 44, which runs from New Delhi to Amritsar. It is 315 km (194 miles) north of Delhi and 142 km (88 miles) southeast of Amritsar.

Source: Wikipedia

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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