As a health and urban planning expert, I've been studying the various factors that contribute to a city's health and well-being. When considering the healthiest city in the world, it's important to take into account a multitude of factors such as air quality, access to healthcare, green spaces, water quality, life expectancy, and the overall lifestyle of the residents. The concept of a "healthy city" is multifaceted and can vary based on the criteria used for evaluation.

Hong Kong, for instance, often tops lists of healthy cities due to its exceptional healthcare system and longevity of its residents. Despite its high population density, Hong Kong has managed to maintain high standards in public health and sanitation, which are crucial for a city's health status.

Tokyo, another contender, is notable for its advanced healthcare infrastructure and its residents' active lifestyle. The city's extensive public transportation system encourages walking and cycling, which contributes to the physical health of its citizens. Additionally, Tokyo's focus on technology and innovation often leads to advancements in medical care and health-related services.

Copenhagen is renowned for its emphasis on sustainability and eco-friendliness. The city's commitment to creating a green environment, with an extensive network of bike lanes and public parks, promotes a healthy lifestyle among its residents. Moreover, Denmark's universal healthcare system ensures that healthcare services are accessible to all.

Stockholm, with its high standards of living and focus on work-life balance, is another city that often ranks highly in health indices. The city's clean environment, coupled with its robust social welfare system, contributes to the well-being of its inhabitants.

Sydney is known for its beautiful outdoor spaces and beaches, which encourage outdoor activities and a healthy lifestyle. Australia's healthcare system is also highly regarded, and the city's climate and environment support a high quality of life.

However, it's important to note that the designation of the "healthiest city" can vary from one index to another, as different organizations may prioritize different aspects of health and well-being. For example, some indices might place more weight on environmental factors, while others might focus more on healthcare access and quality.

In conclusion, while cities like Hong Kong, Tokyo, Copenhagen, Stockholm, and Sydney are often cited as some of the healthiest in the world, the title of the absolute healthiest city can be subjective and dependent on the specific metrics and criteria used for evaluation. It's also worth mentioning that a city's health is influenced by a complex interplay of social, economic, and environmental factors, and no city is without areas for improvement.

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The world's top five healthiest cities?Hong Kong. Hong Kong tops virtually any healthy cities index. ... Tokyo. Tokyo remains the world's biggest city with a greater metropolitan population of some 35 million and -C as with Hong Kong -C one of the wealthiest, producing a GDP of $1,479bn (--922.3bn). ... Copenhagen. ... Stockholm. ... Sydney.read more >>