What data reveals about health and inequality

On high-pollution days in Bogotá, a child with asthma may struggle to breathe on the way to school, an older adult with heart disease should avoid going outside altogether, and outdoor workers may spend hours inhaling air that increases their risk of hospitalization or premature death. For millions of urban residents, air pollution is not an abstract environmental issue, it is a daily health threat.

Air pollution is one of the world’s leading environmental health risks, yet it is also one of the most preventable. New evidence, released by the city of Bogota, shows that cleaner air doesn’t just improve the environment, it can save lives, reduce health inequities, and strengthen cities’ futures.

The Health Impact Assessment found that if the city had met World Health Organization’s air quality guidelines, more than 13,000 premature deaths in the city could have been avoided over a five-year period. Most of these deaths were linked to cardiovascular and respiratory diseases, the same conditions that already place the greatest burden on health systems worldwide.

The data also show that the health impact was not evenly distributed. The analysis examined air pollution and mortality across Bogotá’s localities and found that residents in wealthier areas breathe cleaner air, while lower-income communities, particularly in the southwestern parts of the city, face higher pollution levels and therefore greater health risks. In cities around the world, inequity is the common denominator of air pollution exposure, making clean air an environmental and health justice issue.

Cleaner air also brings economic benefits. In Bogotá alone, preventable deaths linked to air pollution were associated with more than USD 4.5 billion in indirect costs such as lost productivity, premature mortality, and strain on health systems.

By identifying important differences in pollution exposure and premature mortality across localities the findings are now helping frame Bogotá’s current response. The city is strengthening local morbidity data and integrating health and economic analysis into decision-making during air quality warnings, ensuring that response measures are better targeted, more equitable, and grounded in evidence.

Through the Partnership for Healthy Cities, Bogotá is strengthening how health evidence informs decisions during air pollution emergencies. Working together with city authorities, the initiative supported the development of health and socioeconomic impact tools that estimate how many hospitalizations, deaths, and economic losses could be avoided under different response scenarios.

For the first time, the analysis also quantifies avoidable mortality and pollutant concentrations by locality, revealing important disparities across the city. For example, between 2018 and 2022, including the COVID-19 pandemic years, which temporarily changed both pollution levels and health patterns across the city, southwestern parts of the city such as Ciudad Bolívar and Tunjuelito recorded some of the highest average levels of particulate matter, far exceeding WHO guideline values. This enabled the city to prioritize targeted actions in the communities most affected.

Densely populated areas such as Kennedy, Suba and Ciudad Bolívar face the greatest overall economic losses from pollution-related premature deaths, highlighting the need for both targeted local interventions and sustained citywide action.

This collaboration is helping Bogotá strengthen air quality surveillance systems, connects health, environment, and risk management agencies, and enables faster, more coordinated responses when pollution levels rise—protecting the most vulnerable populations, including children, older adults, and people with chronic conditions, and guiding investments in cleaner air where they are needed most.

This shift from reacting late to acting early, and from relying solely on citywide averages to having specific, neighborhood-level insights, shows that with the right data and systems, cities are well-positioned to make practical, life-saving decisions to create clean air, reduce inequities, and deliver healthier cities.