Read more at Yale Climate Connections

• Satellites are being used to track air pollution in over 13,000 cities worldwide.
• A new study found that in over half of these cities, air pollution and carbon dioxide levels rise and fall together because they share a common cause: the burning of fossil fuels.
• In cities with strong economic growth and no emission controls (such as parts of India and sub-Saharan Africa), all four pollutants are increasing.
• Conversely, in cities that have taken steps to limit fossil fuel use, pollution levels are falling across the board.
• The findings demonstrate that reducing fossil fuel use can simultaneously improve air quality and help combat climate change.