• Air quality stripes, a visual tool inspired by climate warming stripes, depict historical air pollution trends.
• These stripes use color to represent particulate matter (PM) concentrations in 176 cities worldwide since 1850.
• Darker colors indicate higher PM levels, highlighting the worsening air quality over time.
• The World Health Organization reports that over 99% of the global population breathes air exceeding recommended levels.
• Air quality stripes serve as a clear reminder of the urgent need for international efforts to address air pollution.

Read more at The Conversation.