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Arizonans can begin enrolling for the health insurance marketplace under the Affordable Care Act on Tuesday.

It’s estimated that 120,000 uninsured Pima County residents are eligible to sign up for health care through the state's federally run exchange.

More than one million Arizonans will be eligible to purchase health insurance through it, said Pati Urias with Enroll America, a nonprofit helping people sign up for healthcare plans through the new federal exchanges or marketplaces.

“This is an historic event, because it’s the first time that people who’ve been declined coverage in the past, such as those with a pre-existing condition (can access it)," she said. "This is their opportunity to look at their options and purchase a health insurance plan that’s going to suit their...needs."

The Arizona exchange has eight insurers and will offer more than 100 health plans, according the U.S. Department of Health and Human Services.

For more information about healthcare coverage options visit healthcare.gov.