There isn't one single "most hygienic" country, as it depends on the metric (air, water, waste, personal habits), but Estonia often tops environmental rankings like the EPI 2024 for overall cleanliness, while Singapore is renowned for meticulous public sanitation and strict anti-littering laws, and Rwanda excels in community-driven cleanliness with its mandatory monthly cleanups (Umuganda) and plastic bag ban. Nordic countries like Finland and Denmark also consistently rank high for air quality and pristine environments.
Australia has been ranked among the cleanest countries in the world, with air quality considered the purest globally. This recognition comes from international environmental indexes that measure pollution, air quality, and sustainable practices.
The cleanest country in the world is Estonia, according World Population Review's Cleanest Countries in the World 2025. The most sustainable countries include Honduras, Moldova, Norway, Sweden, New Zealand, and the UK, based on varying environmental, social and economic factors.
25 Least Hygienic Countries in the World
Fuel & Energy is the top polluter, contributing to around 75% of global greenhouse gas emissions, mainly through fossil fuels like coal, gas, and oil.
Copenhagen, Denmark: The cleanest city on the planet
Currently, the energy mix exceeds 30%, and it is expected to achieve energy independence by 2050. Notable features: Bicycle implementation: Copenhagen has 700,000 bicycles. 62% of its citizens use them.
Which is the Cleanest Country in the World: New Rankings
The EPI ranks countries based on environmental health, including metrics for sanitation, access to clean drinking water, and waste management. Countries that score highly, like Switzerland and other Nordic nations, typically have excellent systems in place to ensure public cleanliness.
No, Australia is not 90% white; while a large majority identify with European ancestry (around 76-80% in recent years), a significant and growing portion identifies as Asian, African, Middle Eastern, or Indigenous, making it a highly multicultural nation with diverse ethnic backgrounds, not overwhelmingly white. Recent census data shows European ancestry (English, Irish, etc.) makes up a large chunk, but Asian ancestries are also substantial, with over 17% Asian population and around 3.8% identifying as Aboriginal or Torres Strait Islander, per the 2021 census data from Wikipedia.
You know that saying, “Come down for air” – aka Tasmania's catchy tourism slogan? Well, you might want to take it seriously, as Hobart came out on top as the city with the lowest air pollution levels in Australia and the third lowest in the world.
Iceland is consistently ranked as the #1 safest country in the world by the Global Peace Index (GPI), a position it has held for over a decade due to extremely low crime, no standing army, high social cohesion, and minimal conflict, though some other reports might place Switzerland or the Netherlands first based on different survey criteria.
1/ Denmark
In 2020 Denmark had the highest level of environmental performance worldwide with an EPI value of 82.5. This is partly due to its progressive government and consistent commitments to the environment and society. No wonder Denmark made it to our list of greenest countries in the world.
Chile. Did you know that the very cleanest water in the world is located in Puerto Williams, Chile? That was recently discovered by scientists at the universities of Texas and Chile. They have collaborated on research into the cleanliness of water resources in the world.
San Bernardino, California, ranks as the dirtiest city in the U.S. according to LawnStarter's 2025 report. Several other San Bernardino County cities, including Ontario, Fontana, Victorville, Rancho Cucamonga, and Apple Valley, also ranked poorly.
Top 10 Best Countries to Live in 2025
New York City - #1
New York City, often referred to as the "financial capital of the world," leads the list as the richest city in 2024. With over 340,000 HNWIs and total private wealth exceeding $3 trillion, NYC is home to Wall Street, luxury real estate markets, and global corporate headquarters.
Almost 99% of the world's population is exposed to air pollution, breathing air that exceeds WHO's safe guideline limits. Air pollution contributes to 6.7 million premature deaths every year, with low- and middle-income countries most affected.
Fossil fuels – coal, oil and gas – are by far the largest contributor to global climate change, accounting for around 68 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions. As greenhouse gas emissions blanket the Earth, they trap the sun's heat.
According to a digital sustainability consultancy, Yard, Taylor Swift is the world's most carbon polluting celebrity due to her footprint in 2022. She is followed by Floyd Mayweather and Jay-Z. The study revealed that only 15% of the population takes 70% of the flights annually.