According to recent reports by IQAir, a Swiss air quality technology company, only seven countries worldwide met the World Health Organization's (WHO) air quality guidelines for PM2.5 levels These nations maintained average PM2.5 concentrations at or below the WHO's recommended limit of 5 micrograms per cubic meter Iceland recorded the cleanest air in Europe, thanks to its low industrial activity, reliance on geothermal energy, and vast open landscapes that naturally filter pollutants Estonia’s air remains clean due to strong environmental regulations, extensive forests covering nearly half the country, and a focus on renewable energy sources like wind and biomass Finland prioritises sustainable living, strict vehicle emissions standards, and widespread use of clean energy sources such as nuclear and hydroelectric power, keeping pollution levels low With vast natural landscapes, strict industrial regulations, and proactive air quality monitoring, Australia maintains some of the cleanest air among developed nations Mauritius’ clean air is the result of limited heavy industry, strict environmental laws, and a focus on preserving its natural ecosystem, including coral reefs and lush greenery that contribute to air purification