TOWSON, Md. (WJZ) — After a busy holiday weekend on the roadways, gas prices throughout Maryland have seen a slight increase, according to AAA Mid-Atlantic.

While the statewide average and a few regions have gone up three cents in the last week, others have seen increases as high as six and seven cents.

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AAA Mid-Atlantic said, along with typical fluctuations, the increase in Maryland prices can also be attributed to a gas sales tax that went into effect on July 1.

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The gas price average in Maryland is $2.22, which is up three cents in the last week and 13 cents in the last month, but down 48 cents from this date last year.

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The national gas price average is $2.19, up a penny in the last week, up 12 cents in the last month and down 56 cents from this time last year.