Yes, China is significantly more polluted than Japan across many metrics, including air and water quality, with China being a major global polluter facing severe challenges from industrialization, while Japan, despite past issues, has advanced pollution controls and focuses on technological solutions, placing it much lower in global pollution rankings.
Bangladesh is frequently cited as the world's most polluted country based on average annual PM2.5 (fine particulate matter) levels, followed closely by Pakistan and India, with high concentrations driven by vehicle emissions, industrial output, and construction, though Chad sometimes tops the list in specific reports, highlighting ongoing severe air quality challenges in South Asia and parts of Africa.
The People's Republic of China (PRC) is the world's largest emitter of greenhouse gases; the largest source of marine debris; the worst perpetrators of illegal, unreported, and unregulated (IUU) fishing; and the world's largest consumer of trafficked wildlife and timber products.
The B(a)P concentration in outdoor air in residential areas of Beijing was approximately 15 times higher than that in residential areas around a main road of Tokyo.
Top 5 most polluting countries
Denmark is ranked as the cleanest and most environmentally friendly country in the world, thanks to its strong focus on renewable energy, waste management, and sustainable urban planning. With extensive wind power usage and eco-friendly policies, it sets a global example for environmental conservation.
99% of people breathe air that exceeds World Health Organization's guideline limits. Source: WHO. 9 out of 10 deaths attributed to outdoor air pollution are in low- and middle-income countries.
As of January 4, 2026, air quality in China remains poor, with major cities experiencing "unhealthy," to "very unhealthy," levels and high PM2. 5 concentrations, posing serious health risks to residents, especially children and the elderly.
Travelers will usually find more to do in Beijing. Although Beijing and Tokyo are popular destinations, Beijing has more sights and attractions for tourists. Beijing is more touristy than Tokyo and is popular for its rich culture, many historical landmarks, its long running history, and its world class cuisine.
Electricity generation has historically been the main source of China's air pollution. However, large coal-powered industries, which are key drivers of China's economic development, have increasingly contributed to China's air pollution problems.
Corruption is a very big issue in china.
Fuel & Energy is the top polluter, contributing to around 75% of global greenhouse gas emissions, mainly through fossil fuels like coal, gas, and oil.
Bahamas topped the list of least polluted countries with PM2. 5 at 3 µg/m³. Other clean air nations include French Polynesia, Iceland, Barbados, and Finland. Nordic countries like Sweden and Finland benefit from renewable energy and low emission industries.
1️⃣ Bangladesh 🇧🇩 – Dense urbanisation, heavy traffic, and industrial emissions 2️⃣ Pakistan 🇵🇰 – Severe winter smog from vehicles, industry, and crop burning 3️⃣ India 🇮🇳 – Pollution driven by transport, coal power, construction, and seasonal burning 4️⃣ Tajikistan 🇹🇯 – Industrial emissions compounded by geography ...
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.
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.
But while in the first quarter of 2025, eastern China's overall air quality improved, pollution rose in provinces to the south and west of the country. PM2. 5 levels in Guangxi, Yunnan and Xinjiang were substantially higher than a year earlier, at 32%, 14%, and 8% respectively.
Dependence on Fossil Fuels – China is rich in coal and other fossil fuels and continues to exploit these resources, despite investing in renewable energy like solar power. This reliance results in high greenhouse gas and particulate matter emissions.
Rankings: Most Polluted Cities in China (2024)
Dr. Haagen-Smit, known by many as the "father" of air pollution control, was a graduate of the University of Utrecht and a biochemistry professor at the California Institute of Technology in Pasadena for 16 years before beginning his air pollution research in 1948.
Cleanest Air in the World in 2023
Over 95% of the world's population has health problems, with over a third having more than five ailments.