Voters will have a chance Tuesday to cast their ballots for a measure that Los Angeles city and county officials say will help end homelessness.

The Los Angeles County Sales Tax for Homeless Services and Prevention, also known as Measure H, proposes a quarter-cent sales tax to raise an estimated $355 million a year for 10 years to help homeless people transition into planned affordable housing, officials have said.

“From Pomona to Palisades, from Palmdale to (San) Pedro, we have too many unhoused Angelenos,” Los Angeles Mayor Eric Garcetti said during a news conference in January, when Measure H was formally unveiled.

“It is unacceptable in Los Angeles,” he added. “It is unforgivable if we do nothing about it.”

In November, Los Angeles city voters passed Proposition HHH, a property tax bond measure that is supposed to raise $1.2 billion to build 10,000 affordable-housing units for the homeless. But the money only funds the bricks and mortar. City and county officials as well as service providers say the affordable-housing complexes they plan to build also need “wrap-around services” to help formerly homeless people adapt to living off the streets and, if needed, to treat addictions.

So in December, the Los Angeles County Board of Supervisors voted to place Measure H on the ballot.

“There is an urgent need to provide prevention, crisis, and support services, including health care, mental health services, and substance abuse treatment for homeless children, families, foster youth, seniors, battered women, disabled individuals, veterans, and other homeless adults,” according to the motion introduced by supervisors Mark Ridley-Thomas and Janice Hahn.

An estimated 47,000 people are considered homeless in Los Angeles County on any given night, according to the 2016 results of a count overseen by the Los Angeles Homeless Services Authority.

The gradual increase of men, women and children sleeping on the streets and in shelters prompted the city and county in 2015 to declare homelessness an emergency, agreeing to spend hundreds of millions of dollars to bolster rapid re-housing and other programs.

Hahn said the quarter-cent sales tax means consumers would spend 10 cents on the purchase of a $40 sweater or $1 on a $400 television.

While no formal opposition against Measure H has been listed, Los Angeles residents will note the changes in their sales taxes come July 1.

Last November, county residents approved Measure M, a half-cent sales tax to raise money to strengthen public transportation. The measure goes into effect in July. The average sale tax across Los Angeles County is 9 percent. But even some business leaders call Measure H a good investment in the long run.

“Businesses realize that the cost of doing nothing is not nothing,” Gary Toebben, president and CEO of the Los Angeles Area Chamber of Commerce said during the same January news conference Garcetti attended. “We also realize that investing in the future is essential. Measure H is a wise investment and a smart decision.”