Over 6,000 Cities Now Monitor Air Quality
Almost the entire global population (99%) breathes air that exceeds World Health Organization (WHO) air quality limits, and threatens their health. A record number of over 6,000 cities in 117 countries are now monitoring air quality, but the people living in them are still breathing unhealthy levels of fine particulate matter and nitrogen dioxide, with people in low and middle-income countries suffering the highest exposures.
