California gas prices are likely to rise along with the rest of the country as summer approaches, due in part to global events and state environmental laws. The state’s reformulated gasoline program produces cleaner-burning gas that reduces emissions, contributing to higher prices.
The program, introduced in the 1990s, ensures cars burn more environmentally friendly fuel, adding to California’s already high gas taxes. This unique combination leads to some of the country’s most expensive gas prices.
Blends of gasoline vary seasonally and produce less greenhouse gases than traditional gas. The seasonal changes cause prices to fluctuate: cheaper gas in winter, higher prices in spring, and more expensive gas with the summer blend.
The effects of global events on future gas prices are uncertain at this time.
Source: https://www.kqed.org/news/12026185/gas-prices-rising-trumps-tariff-threats-could-be-playing-part