Which is the no. 1 cleanest country in the world?

Which is the number one cleanest country in the world depends on ranking system, but according to Environmental Performance Index EPI, which measures air quality, water, waste management, and sustainability, countries that consistently rank cleanest include Denmark, Switzerland, Finland, Sweden, and Iceland. In recent EPI rankings, Denmark often ranks as number one cleanest country due to excellent air quality, low emissions, advanced waste management and recycling, clean water, and strong environmental policies focused on renewable energy and sustainability. Switzerland also frequently ranks number one or top three for cleanliness due to pristine landscapes, strict environmental laws, excellent waste management, and high air and water quality. Finland, Sweden, and Norway also rank top for cleanest air, low pollution, and sustainable living. For ocean and litter cleanliness, countries like Iceland and New Zealand rank high. Cleanest is subjective, but Denmark is often cited as number one cleanest country in world by EPI for overall environmental cleanliness, air quality, and low pollution, followed by Switzerland and Finland. These countries invest heavily in green energy, public transport, recycling, and environmental protection, resulting in very clean cities, water, and low litter and pollution levels compared to global average.