In 2025, the world’s cleanest countries are not just global leaders in environmental health—they are also innovators in climate policy, renewable energy, and sustainable development. These nations have earned top rankings through rigorous assessment by the Environmental Performance Index (EPI) and the Climate Change Performance Index (CCPI), which together provide the most authoritative and data-driven evaluations of national environmental performance.

The EPI, developed by Yale and Columbia Universities, uses 58 indicators across 11 categories—ranging from air and water quality to biodiversity and climate policy—to rank 180 countries on how well they meet sustainability targets. The CCPI, meanwhile, evaluates 63 countries and the EU, covering over 90% of global greenhouse gas emissions, and assesses performance in GHG emissions, renewable energy, energy use, and climate policy.

These indices are vital tools for policymakers, businesses, and communities, offering a granular view of each country’s strengths and weaknesses, helping to set targets, track trends, and identify best practices for a sustainable future. High-ranking countries benefit from advanced regulatory frameworks, greener infrastructure, and new market opportunities for sustainable technologies. Here’s a closer look at what sets each of the top 10 apart in 2025:

1. Estonia (EPI Score: 75.3)

Estonia leads the world in cleanliness and sustainability, thanks to its extensive forest cover, effective use of bioenergy, and a strong focus on natural resource management. The country has set ambitious climate goals, including a 70% reduction in greenhouse gas emissions by 2030 and carbon neutrality by 2050.

Estonia achieved an 11.3% emissions reduction in late 2024, outpacing the rest of the EU, even as its economy grew. The capital, Tallinn, has become a beacon of urban sustainability, winning the ITB Earth Award 2025 for its zero-waste Song and Dance Celebration, which drastically cut single-use plastics and promoted circular economy practices.

Estonia’s environmental policies have also led to Europe’s cleanest air and ongoing investments in wind, solar, and energy storage. However, the country faces challenges in fully phasing out fossil fuels and balancing biomass production with forest conservation.

2. Luxembourg (EPI Score: 75.0)

Luxembourg stands out as a small nation with outsized environmental achievements, earning an EPI score of 75.0 in 2024 and a 4.1-point rise over the past decade. The country leads the world in water management, boasting a near-perfect score of 90.6 in Water Resources and an astounding 99.8 in Sanitation & Drinking Water. Over 55% of Luxembourg’s land is protected, contributing to a top-tier biodiversity score of 84.8.

The nation’s capital has pioneered green investments, while advanced wastewater treatment and strict EU-aligned standards keep pollution low. While Luxembourg excels in ecosystem vitality and heavy metal pollution control, it continues to work on reducing per capita greenhouse gas emissions and curbing tree cover loss.

3. Germany (EPI Score: 74.6)

Germany ranks third globally with an EPI score of 74.6 in 2024, marking a 4.4-point improvement over ten years. The country treats 100% of its urban wastewater, achieving a high 89.1 in Water Resources, and protects a significant share of its land and seas, reflected in its 82.4 Biodiversity & Habitat score.

Germany’s robust environmental policies are complemented by massive investments in green infrastructure and renewable energy. The nation’s cities are recognized for clean air, efficient public transport, and progressive urban planning. Germany’s approach demonstrates that sustainability can go hand in hand with industrial progress, though ongoing industrial emissions remain a challenge.

4. Finland (EPI Score: 73.7)

Finland secures the fourth spot with a 2024 EPI score of 73.7, though this reflects a slight decrease from its 2014 score. The country is a global leader in public health, scoring a perfect 100.0 in both Sanitation & Drinking Water and Heavy Metals. Finland’s well-managed forests, protected natural areas, and clean air contribute to its strong ecosystem vitality.

The nation’s deep cultural connection to nature is evident in its policies, which seamlessly integrate sustainability into daily life. Finland’s challenge lies in maintaining its high standards amid growing urbanization and climate pressures.

5. United Kingdom (EPI Score: 72.7)

The United Kingdom earns an EPI score of 72.7 in 2024, up by 2.1 points over the past decade. The UK has made significant progress in reducing carbon emissions, largely through aggressive wind energy deployment and expanded recycling programs. Urban green spaces and biodiversity conservation have improved city livability and environmental health.

The UK continues to update its climate policies to meet international targets, but faces ongoing challenges with air quality in some metropolitan areas and the need for further emissions reductions.

6. Sweden (EPI Score: 70.5)

Sweden ranks sixth with a 2024 EPI score of 70.5, showing a modest 1.6-point increase over ten years. The country’s energy mix is dominated by hydropower and wind, and it is a pioneer in negative emissions technologies.

Sweden’s cities are models of sustainable urban development, and the nation’s commitment to clean air, water, and biodiversity is unwavering. However, Sweden faces pressure to further reduce emissions from transportation and industry to meet its ambitious climate goals.

7. Norway (EPI Score: 70.0)

Norway holds the seventh position with a 2024 EPI score of 70.0, up 3.6 points over the last decade. The country boasts nearly universal access to clean drinking water and sanitation, and its electricity is almost entirely supplied by hydropower.

Norway’s proactive climate policies and investments in electric mobility and carbon capture have resulted in some of the world’s lowest per capita emissions. The country’s challenge is balancing oil and gas exports with its climate commitments.

8. Austria (EPI Score: 69.0)

Austria scores 69.0 on the 2024 EPI, reflecting a slight decrease of 0.3 points over ten years. The country excels in maintaining clean cities and countryside through strict agricultural and chemical regulations. Austria’s public transport system and urban planning support eco-living, while strong environmental laws ensure high water quality and effective waste management.

Austria’s challenge is to address areas of stagnation and reinvigorate progress on climate adaptation and emissions reduction.

9. Switzerland (EPI Score: 68.0)

Switzerland earns a 2024 EPI score of 68.0, up 1.8 points over the last decade. The country is renowned for its pristine landscapes, robust waste management, and advanced water treatment systems.

Switzerland’s environmental protection laws and public engagement in sustainability initiatives help maintain high living standards and ecological health. However, Switzerland must continue to innovate in renewable energy and reduce its ecological footprint to stay ahead.

10. Denmark (EPI Score: 67.9)

Denmark rounds out the top ten with an EPI score of 67.9 in 2024, a 1.7-point increase over ten years. The nation is a global leader in wind energy and urban planning that prioritizes cycling and green spaces. Denmark’s comprehensive recycling policies and low pollution levels make it a model for clean living. 

The country’s ongoing challenge is to further cut emissions from agriculture and transportation while maintaining economic growth.

How Are These Rankings Determined?

Environmental Performance Index (EPI):

• Uses 58 indicators across 11 categories, including air quality, water and sanitation, biodiversity, habitat protection, and climate policy.
• Weights environmental health (40%) and ecosystem vitality (60%) to reflect both immediate human well-being and long-term sustainability.
• Draws data from the WHO, UN, and other global agencies, providing a scorecard for each country and highlighting leaders and laggards.

Climate Change Performance Index (CCPI):

• Assesses four main categories: GHG emissions (40%), renewable energy (20%), energy use (20%), and climate policy (20%).
• Uses 14 indicators, combining quantitative data (from IEA, FAO, UNFCCC) and qualitative expert assessments of national and international climate policy.
• Covers 63 countries and the EU, representing over 90% of global GHG emissions.

These indices are not just academic—they guide policy, inform investment, and help countries benchmark progress toward sustainability goals. High-ranking countries typically have strong regulatory frameworks, transparent governance, and engaged civil societies, making them attractive for sustainable business and investment.

Why Does This Matter?

• Policy Guidance: Countries use EPI and CCPI data to set targets, track trends, and refine environmental policies.
• Business and Investment: High scores signal a favorable environment for green investment and sustainable business operations.
• Public Health: Clean air, water, and effective waste management directly improve quality of life and reduce healthcare costs.
• Global Leadership: These nations serve as models for others striving to balance economic growth with environmental stewardship.

Summary point

As environmental challenges grow increasingly urgent worldwide, the achievements of these top 10 cleanest countries in 2025 offer both inspiration and a practical roadmap for sustainable development. Their success demonstrates that with visionary leadership, innovative technologies, and committed public participation, it is possible to safeguard natural resources, improve public health, and foster economic growth simultaneously.

By learning from their policies and practices, other nations can accelerate their own journeys toward a cleaner, greener, and more resilient future—ensuring a healthier planet for generations to come

Turkish Airlines has been officially crowned “Best Airline in Europe” for the tenth time at the 2025 Skytrax World Airline Awards, held at the Air and Space Museum in Paris on June 17. This milestone achievement was determined by the votes of millions of passengers from over 100 nationalities, who participated in the world’s largest airline satisfaction survey between September 2024 and May 2025.

The Turkish flag carrier’s consistent excellence was further highlighted by a sweep of eight major awards, including “World’s Best Business Class Onboard Catering,” “Best Airline in Southern Europe,” “Best Economy Class in Europe,” and “Best Economy Class Onboard Catering in Europe,” underscoring its dominance in both premium and economy travel markets.

Turkish Airlines’ reputation for connecting more countries than any other airline remains unmatched, supported by a rapidly expanding fleet that is expected to reach approximately 530 aircraft by the end of 2025. The airline carried 85.2 million passengers in 2024, with strong growth continuing into 2025, as January alone saw 6.8 million travelers—a rise of over 8% from the previous year.

This growth is fueled by ongoing investments in new, fuel-efficient aircraft such as Airbus A321neos and A350s, and by a robust order book of more than 270 aircraft, positioning Istanbul as a major global aviation hub.

Service innovation is another pillar of Turkish Airlines’ success. By the end of 2025, the airline plans to offer all passengers free, unlimited, high-speed in-flight connectivity, retrofitting its entire fleet with the latest technology in partnership with leading local and international suppliers. A recent Memorandum of Understanding with TCI Aircraft Interiors and Turksat highlights Turkish Airlines’ commitment to supporting Turkish innovation in aviation technology.

Sustainability also features prominently in the airline’s agenda. The “Tomorrow On-Board” initiative, launched in 2024, sets out a comprehensive framework for sustainable operations, including the use of eco-friendly inflight products and transparent communication of environmental goals. This program aims to inspire both passengers and investors, reinforcing Turkish Airlines’ pledge to reduce its environmental impact and promote a better future for the industry.

Globally, Turkish Airlines’ recognition comes in a competitive landscape, with Qatar Airways taking the title of “World’s Best Airline,” followed by Singapore Airlines and Cathay Pacific.

Despite this, Turkish Airlines’ continued accolades in Europe and its strong operational performance underscore its status as a leader in global aviation, renowned for world-class service, innovative passenger experiences, and a commitment to sustainability

About to jet off for your summer holiday? You might be flying with one of the world’s best airlines, according to the prestigious 2025 Skytrax World Airline Awards, announced on June 18. Known as the ‘Oscars of aviation,’ these awards are based on extensive customer surveys evaluating over 350 airlines worldwide, culminating in a ranking of the top 100 carriers.

For the ninth time in its 26-year history, Qatar Airways claimed the coveted title of World’s Best Airline, reaffirming its dominance in global aviation. The Qatari national carrier also secured top honors for Best Business Class, Best Airline in the Middle East, and Best Business Class Lounge, underscoring its commitment to premium service and innovation.

While no UK airline broke into the top 10, two British carriers made a strong showing in the top 20—a remarkable feat given the fierce international competition. British Airways held steady at 13th place, maintaining its position from 2024, while Virgin Atlantic climbed one spot to 16th. Virgin Atlantic also earned a special accolade for the World’s Best Premium Economy Class, highlighting its excellence in passenger comfort and service.

The full top 10 list featured other global heavyweights such as Singapore Airlines, which ranked second and was recognized for the World’s Best Airline Cabin Staff and Best First Class, and Cathay Pacific Airways, which took third place. The awards ceremony, held during the Paris Air Show at Le Bourget’s Air and Space Museum, celebrated the crème de la crème of the skies, with winners spanning full-service, low-cost, and regional airlines.

So, as you prepare for your summer getaway, take pride in knowing that if you’re flying with Qatar Airways, British Airways, or Virgin Atlantic, you’re in the hands of some of the world’s finest airlines, as voted by millions of global travelers.

Qatar Airways has further cemented its reputation as a global aviation leader by sweeping the top honors at the 2025 Skytrax World Airline Awards, held at the Paris Air Show’s Air and Space Museum.

The airline was named the World’s Best Airline for a record ninth time, an unprecedented achievement in the 26-year history of the awards, often dubbed the “Oscars of the aviation industry”. This recognition highlights Qatar Airways’ sustained excellence in service, innovation, and passenger satisfaction.

In addition to the coveted overall title, Qatar Airways dominated the Business Class categories. The airline was awarded World’s Best Business Class, with its signature Qsuite once again earning praise for its industry-leading privacy, comfort, and innovative design.

The Qsuite’s unique features, such as sliding doors and the option to create double beds or private suites for families and colleagues, have set new benchmarks for business travel luxury.

The Al Mourjan Garden Lounge at Hamad International Airport in Doha was named the World’s Best Business Class Airline Lounge, recognized for its sophisticated design, extensive amenities, and tranquil atmosphere that offers travelers a premium pre-flight experience.

The lounge is part of the airport’s broader commitment to excellence, with Hamad International itself having recently been awarded for the world’s best airport shopping experience.

Qatar Airways also retained the title of Best Airline in the Middle East, further establishing its dominance in the region amid strong competition from other Gulf carriers like Emirates and Saudia.

CEO Engr. Badr Mohammed Al-Meer emphasized that these accolades are a testament to the passion, precision, and dedication of the airline’s staff, both on the frontlines and behind the scenes, as they strive to set new standards in aviation.

Skytrax CEO Edward Plaisted lauded Qatar Airways’ remarkable achievement, noting the airline’s consistently high performance across multiple categories and its role in shaping the future of air travel.

The airline’s continued recognition as a Skytrax Five-Star Airline further underscores its mission to deliver world-class service and inspire loyalty among millions of travelers worldwide.

Singapore Airlines (SIA) has been recognized as the world’s second-best airline for 2025 at the Skytrax World Airline Awards, held during the Paris Air Show at Le Bourget Airport. The awards, often dubbed the “Oscars of the aviation industry,” are determined by passenger votes, with this year’s survey drawing responses from over 22 million travelers and evaluating more than 325 airlines globally.

Qatar Airways claimed the top spot for a record ninth time, while Cathay Pacific, Emirates, and ANA All Nippon Airways completed the top five.

Despite not reclaiming the top position, SIA achieved an impressive sweep of major accolades, including World’s Best Cabin Crew, World’s Best First Class, and Best Airline in Asia. Its First Class suites, renowned for their spacious design and luxury amenities, were highlighted as industry leaders. The airline also received recognition for its business and economy class offerings, maintaining its reputation for service excellence across all cabin classes.

The Skytrax awards are highly regarded in the industry, with winners selected through independent surveys that have been conducted annually since 1999. The event saw attendance from around 500 airline representatives, including senior executives and uniformed cabin crew, underscoring its significance within the aviation sector.

SIA’s low-cost subsidiary, Scoot, was also honored as the World’s Best Long-Haul Low-Cost Airline, reflecting the group’s broad appeal and commitment to quality at multiple price points. The consistent performance of Singapore Airlines, which has previously won the World’s Best Airline title five times, is seen as a testament to its enduring focus on customer experience, innovation, and operational excellence.

The Skytrax methodology relies on passenger feedback regarding various aspects of the travel experience, including cabin comfort, onboard service, and catering, making the awards a direct reflection of customer satisfaction. SIA’s continued presence at the top of these rankings highlights its global standing and the loyalty it commands among travelers worldwide

German aviation vlogger Josh Cahill, known for his candid airline reviews and a YouTube following of over 788,000, has made headlines after being seen onboard a Qatar Airways aircraft at the 2025 Paris Air Show—his first time on the airline’s plane since a high-profile ban in December 2023.

The controversy began when Cahill published a critical review titled “The Shocking Decline of Qatar Airways,” documenting his negative experiences on a flight from Colombo to London via Doha. The review highlighted issues such as dirty bathrooms, unhelpful crew, and outdated cabins, quickly drawing widespread attention and sparking debate among aviation enthusiasts.

Qatar Airways, displeased with the negative publicity, reportedly offered Cahill a complimentary flight in exchange for removing the video a request he refused. The airline then asked for the removal of negative comments about employee working conditions, which Cahill also declined.

After these refusals, Qatar Airways attempted to have the video taken down from YouTube, citing privacy concerns for crew members. YouTube sided with Cahill, leaving the video online. The airline then invoked its contract of carriage, which prohibits unauthorized onboard filming, and informed Cahill by email that his upcoming booking was canceled and that he would not be allowed to make future reservations.

The fallout extended beyond Cahill. According to sources cited by Cahill, the entire crew from his reviewed flight was reportedly terminated after the airline failed to remove the video, though this has not been independently substantiated. Cahill has since appealed to Qatar Airways’ new CEO, Badr Al Meer, to reconsider the crew’s dismissal.

At the 2025 Paris Air Show, Qatar Airways featured a static display of its Boeing 777-300ER. As is customary at such events, attendees including Cahill were allowed onboard to view the product. Qatar Airways staff, apparently unaware of his ban, welcomed him aboard, and Cahill posted a photo from the QSuite Business Class on social media, captioning it: “Perhaps Qatar Airways will unban me now”. The airline has consistently declined to comment on the incident or clarify the current status of the ban.

Cahill’s experience has intensified debate over airline transparency and the rights of online reviewers. He has expressed concern that banning passengers for negative reviews sets a troubling precedent for censorship in the industry. His story has garnered thousands of comments online, with many viewers criticizing Qatar Airways’ handling of the situation.

The incident comes amid several major developments at the Paris Air Show, including substantial aircraft orders by Riyadh Air and LOT Polish Airlines, temporary booth closures by Israeli defense companies due to political tensions, and Boeing’s subdued presence following a recent fatal crash involving the 787 Dreamliner.
Cahill’s unexpected return to a Qatar Airways cabin—albeit on a non-operational aircraft—adds a new chapter to a saga that continues to spark discussion across the aviation world.