What percentage of the global population breathes air exceeding WHO guideline limits?

The correct answer indicates that over 90% of the global population breathes air that exceeds the World Health Organization (WHO) guideline limits for air quality. This high percentage reflects the significant challenge of air pollution worldwide, highlighting that many people live in areas where pollutants such as particulate matter, nitrogen dioxide, and sulfur dioxide are present at levels that the WHO considers harmful to health.

The implications of this statistic are profound, as poor air quality is linked to various health issues, including respiratory diseases, cardiovascular problems, and overall decreased life expectancy. The data underscores the urgent need for global efforts to improve air quality standards and implement measures to reduce pollution sources.

In contrast, other percentages like 50% or 30% suggest much lower levels of affected individuals and do not convey the overwhelming scale of the air quality crisis. As recent studies and reports continue to emerge, it becomes clearer that the issue is severe enough that a large majority of the global population is affected, reinforcing the validity of the chosen answer.