Vienna declared as having world's highest quality of living

For 19 years, the global consulting firm Mercer has been investigating, assessing and ranking the world's cities according to their overall quality of living.

This time around, the top spot goes to Vienna, which has held the title for 8 consecutive years.

Top 10 cities with the highest quality of living

European cities dominate the top 10, with Zurich ranking 2nd, Munich 4th, and Dusseldorf 6th.

Slots seven through 10 are awarded to, in order, Frankfurt, Geneva, Copenhagen, and Basel.

The only two cities outside of Europe included in the uppermost tier are Auckland at 3rd and Vancouver in 5th.

SEE ALSO: GOP lawmaker under fire for support of far-right Dutch politician, white nationalist

While no U.S. cities cracked the top 10, a number made it into the top 50.

They include San Francisco at 29, Boston at 35, and Honolulu at 36.

According to Mercer, infrastructure is a key factor in determining a city's quality of life.

The company notes, "Easy access to transportation, reliable electricity, and drinkable water are all important considerations..."