In the 1990s, the Mobil Oil Corporation acquired the rights to increase pollution by 900 pounds of sulfur dioxide per day at its Torrance, California, refinery

In the 1990s, the Mobil Oil Corporation acquired the rights to increase pollution by 900 pounds of sulfur dioxide per day at its Torrance, California, refinery. These rights were purchased from South Gate, California, at a price of $3 million after the latter acquired them from General Motors. As a result of this change, Mobil increased its output of air pollution in Torrance, California, by 900 pounds per day. Did pollution in California increase or decrease as a result of the sale of these pollution rights from South Gate to Mobil? Assume that South Gate is a corporation operating in California. Please explain.