![]() ![]() The report that combined ground-based air quality data with satellites and models to produce air quality estimates for cities around the world suggested that the strategic investments in ground-level air quality monitoring systems and expanded use of satellites and other emerging technologies in targeted regions can provide critical first steps toward cleaner air. According to the WHO’s Air Quality Database, only 117 nations currently have ground-level monitoring systems to track PM2.5, and only 74 nations are monitoring NO2 levels. ![]() Underlining that as much as 68% of the world’s population is expected to live in urban areas by 2050, the report said, "This rapid urbanization places the world’s top cities at the forefront in the battle to reduce the health effects of air pollution, especially in low- and middle-income countries." The report, however, also highlights data gaps in low- and middle-income nations, a key aspect to understanding and addressing the health effects of air pollution. "As cities around the world rapidly grow, the impacts of air pollution on residents’ health are also expected to increase, underscoring the importance of early interventions to reduce exposures and protect public health," said Pallavi Pant, HEI senior scientist who oversaw the report’s publication. Beijing featured in both the top 10 lists. Petersburg (Russia), Beijing (China), Cairo (Egypt), Ashgabat (Turkmenistan), Minsk (Belarus), Istanbul (Turkey) and Ho Chi Minh City (Viet Nam) are the top most polluted cities due to NO2 exposure. Delhi, Kolkata, Kano (Nigeria), Lima (Peru), Dhaka (Bangladesh), Jakarta (Indonesia), Lagos (Nigeria), Karachi (Pakistan), Beijing (China) and Accra (Ghana) figured as the top 10 most polluted cities due to exposure to PM2.5 while Shanghai, Moscw, Tehran (Iran), St. ![]()
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