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 expanded its complimentary “Touristanbul” program, offering international transit passengers with layovers of 6 to 24 hours at Istanbul Airport (IST) a unique opportunity to explore the city’s rich history and culture without leaving the airport experience behind.

Eligible travelers can choose from six different daily tours, each led by professional guides and including transportation by shuttle bus directly from the airport.

One of the highlights of the program is a visit to Bozdağ Film Studios in Beykoz, a sprawling 200-acre complex renowned for producing popular Turkish historical TV dramas like "Diriliş: Ertuğrul" and "Kuruluş: Osman."

This studio is the largest in Europe and the third-largest in the world, offering visitors a behind-the-scenes look at life-sized sets that recreate different eras of Turkish history.

Beyond the film studio, the various tour routes cover Istanbul’s most iconic landmarks, such as the Blue Mosque, Dolmabahçe Palace, Hippodrome, Taksim Square, Grand Bazaar, and the Galata Bridge, with photo stops and guided commentary throughout.

Passengers can also enjoy authentic Turkish cuisine—such as fire-cooked soup and hand-pounded rice pudding—at local restaurants, and participate in cultural workshops like glassmaking and archery.

All meals, museum entrance fees, and transportation are included at no cost, and the tours are available every day of the year, with 19 different routes offered weekly. To participate, passengers must have a Turkish Airlines ticket with a layover of 6 to 24 hours, and must register at the Touristanbul desk at least 30 minutes before the tour begins.

The program is designed to ensure travelers return to the airport with ample time for their connecting flights, transforming what could be idle hours into a memorable cultural experience.

Etihad Guest, the loyalty program of Etihad Airways, has expanded its highly popular competition, The Extraordinary Challenge, by increasing the total prize pool to over 20 million Etihad Guest Miles following an unprecedented surge in participation.

Initially, the challenge offered 5 million miles to the first member to visit all 15 of Etihad’s newly launched destinations, with second and third place receiving 3 million and 1 million miles, respectively. However, due to overwhelming demand, Etihad has now added 12.5 million additional miles, opening the door for more than 200 winners in total.

The competition, which runs until May 25, 2026, is open to both new and existing Etihad Guest members. Participants must travel to or from 15 specific new year-round destinations, including cities such as Addis Ababa, Atlanta, Prague, and Taipei, within a 12-month period. The race is based on speed and dedication—the fastest members to complete all 15 routes win the largest prizes, while tie-breakers are resolved by the earliest registration date.

In addition to the top three grand prizes, Etihad has introduced "The Extraordinary Milestones" category: the first 100 members to visit five new destinations will receive 25,000 miles each, and the first 100 to reach ten destinations will earn 100,000 miles each. This expansion aims to reward both the most ambitious travelers and those making significant progress, with members able to track their journeys and standings on a live digital leaderboard.

Mark Potter, Managing Director of Etihad Guest, commented, “We’ve seen an amazing response across the globe since we launched The Extraordinary Challenge, and expect to see over 50,000 member sign-ups as more destinations come online. Having seen the desire and determination of so many, we wanted to reward Etihad Guest members even more by giving flight to their ambition with more prize miles and potential for 200 additional winners”.

Sohar International and its Islamic banking division, Sohar Islamic, have announced a new partnership with SalamAir, Oman’s prominent budget airline, to bring substantial savings to their customers on domestic travel. Under this collaboration, credit cardholders from Sohar International and Sohar Islamic can enjoy up to 40% off, while debit cardholders receive a 15% discount on SalamAir flights within Oman.

The offer covers popular routes such as Muscat to Salalah, Masirah, Duqm, and the newly introduced Sohar to Salalah flights, with bookings available from June 22 to August 31, 2025, for travel between July 1 and August 31, 2025.

To take advantage of these discounts, eligible customers must book their tickets through SalamAir’s official website, applying special promo codes provided by the banks and using their Sohar cards for payment. The partnership was officially launched at a signing event on June 17, 2025, at Sohar International’s headquarters, highlighting a shared vision to blend financial services with lifestyle benefits and support Oman’s national tourism strategy outlined in Vision 2040.

Bank officials, including Abdul Qadir Al Sumali, stressed that the initiative is designed to go beyond simple discounts, aiming to create a more integrated experience for customers by connecting banking with travel. Steven Allen, SalamAir’s Chief Commercial Officer, noted that the airline is committed to making domestic travel more affordable, especially during the busy Khareef season in Salalah.

SalamAir, which operates a growing fleet of Airbus aircraft and serves over 80 flights daily, is also investing in digital upgrades, such as a new WhatsApp ticketing service. The airline has introduced fixed fares for Omani nationals on key routes to further support local travelers.

This partnership not only delivers significant value to Sohar International and Sohar Islamic customers but also contributes to the wider goals of enhancing domestic tourism and strengthening collaboration between Oman’s banking and aviation sectors.

Air Arabia has launched a major summer mega sale, offering one-way fares starting from just Dh149 for select destinations across its network. The promotion is available for bookings made between June 30 and July 6, 2025, with travel permitted from July 14 to September 30, 2025—a period that covers the busy summer holiday season and is ideal for families and travelers looking for affordable getaways.

The discounted fares apply to a wide variety of routes from Sharjah and Abu Dhabi. Travelers departing from Sharjah can fly to Bahrain and Muscat for as low as Dh149, while fares to Dammam, Riyadh, Salalah, and Kuwait start at Dh199. Routes to Abha, Tabuk, and Yanbu are available from Dh298, Doha from Dh399, Jeddah and Medinah from Dh449, and Taif from Dh574.

For those heading to South Asia, Abu Dhabi to Chennai fares start at Dh275, Kochi at Dh315, Dhaka at Dh499, and Chattogram at Dh549. From Sharjah, travelers can book flights to Ahmedabad from Dh299, Delhi from Dh317, Mumbai from Dh323, Thiruvananthapuram from Dh325, and Kathmandu from Dh449. These special rates are especially appealing for the large South Asian expatriate community in the UAE.

Air Arabia’s summer sale comes as the airline reports strong financial growth, with a net profit of Dh355 million in the first quarter of 2025—a 34 percent increase year-on-year. The airline also saw a 14 percent rise in turnover to Dh1.75 billion and carried more than 4.9 million passengers in the first three months of the year, achieving an average seat load factor of 84 percent.

The airline is also expanding its network, with the resumption of direct flights between Sharjah and Damascus starting July 10, 2025, operating twice daily. All fares in the promotion are one-way and include surcharges, but airport taxes may not be included and are subject to change. Seats are limited and are expected to sell out quickly, so travelers are encouraged to book early to secure the best deals.

For passengers needing flexibility, Air Arabia allows modifications or cancellations of bookings online, via its call center, or at sales offices, though fare differences and terms may apply

Cebu Pacific, the Philippines’ largest low-cost airline, has announced a special seat sale in honor of the country’s 127th Independence Day, offering one-way base fares from Dubai to Manila for just Dh3. The promotion, part of the airline’s annual Super Seat Fest, is available for bookings made between June 11 and June 15, 2025. The travel period for these discounted tickets spans from December 1, 2025, to May 31, 2026, making it ideal for those planning year-end holidays or summer visits to the Philippines.

The Dh3 fare covers only the base ticket price, with additional charges for taxes and surcharges. Cebu Pacific’s extensive network allows travelers to connect from Manila to 37 domestic and 26 international destinations, including popular tourist spots like Boracay, the Banaue Rice Terraces, Vigan, and Davao’s Seven Falls. The airline encourages passengers to explore the Philippines’ rich historical and cultural sites, such as Intramuros and the National Museum complex in Manila.

Booking is available through Cebu Pacific’s official website, with multiple payment options including credit cards, debit cards, and e-wallets. The airline also offers special guidelines for families traveling with infants or minors: infants under two years old may travel on an adult’s lap for an infant fee, and strollers or car seats can be brought free of charge. Children aged 12 and above are considered adult guests, and minors traveling with parents only need to present documents proving their relationship, such as a birth certificate or valid IDs.

Seats at the promotional rate are limited and subject to availability, so travelers are encouraged to book early. Cebu Pacific’s Super Seat Fest is a recurring event, celebrated alongside major milestones and holidays, and continues to be popular among Filipinos abroad looking for affordable ways to reunite with family or explore the country’s diverse attractions.