Gas prices: Increase at the pumps ahead of July 4 holiday

Gas prices increased on Tuesday ahead of the July 4 holiday. The average price for a gallon of regular gas rose to $3.501, according to AAA .

It was the first increase in two days. On Monday, regular gas was $3.491 per gallon, and on Sunday, it was $3.492.

A week ago, the average price for a gallon of regular gas was $3.469. A month ago, it was $3.536 per gallon. A year ago, the average price for a gallon of regular gas was about the same, coming in at $3.535.

California had the country’s most expensive gas on Tuesday, with a gallon of regular gas costing $4.79. Conversely, Mississippi had the cheapest gas prices, with a gallon of regular gas costing $2.957 on Tuesday.

Gas prices continue to vary significantly in each state. To see how expensive gas is in each state, click here .

Here are the gas prices for a gallon of regular-grade gas in and around Washington, D.C., heading into the holiday.

The average price for a gallon of regular gas in the nation's capital was $3.671 on Tuesday, a slight increase from yesterday's price of $3.665. A week ago, gas was $3.661 per gallon. A month ago, a gallon of regular gas was slightly more expensive than it cost on Tuesday, coming in at $3.707 per gallon.

The average price for a gallon of regular-grade gas in Virginia on Tuesday was $3.356. This was an increase from yesterday's average price of $3.328 per gallon. A week ago regular-grade gas was $3.319 per gallon in Virginia. A month ago, it was $3.428.

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On Tuesday, the average price for a gallon of regular gas in Maryland was $3.570. This slightly increased from yesterday, when gas was $3.563 per gallon. A week ago, the price was $3.513 per gallon. Gas prices are cheaper now than they were a month ago, when it cost $3.615 per gallon.

The average price for a gallon of regular gas in Delaware on Tuesday was $3.474. This was a decrease from yesterday's price of $3.502 per gallon. A week ago, the price was $3.446 per gallon. A month ago, it was $3.482.