NASA sensors track deadly air pollution in Addis Ababa
A network of roof-mounted units is measuring fine particulate matter in the Ethiopian capital, revealing how traffic and seasonal events drive spikes in a pollutant linked to millions of global deaths.
NASA’s Multi-Angle Imager for Aerosols (MAIA) is currently deploying a network of ten roof-mounted air sensors in Addis Ababa, the capital of Ethiopia. The units are designed to provide a detailed assessment of the city’s air quality by monitoring particulate matter that is 2.5 micrometers or less in diameter, commonly referred to as PM2.5.
The sensors specifically target black carbon, also known as soot, which is a significant component of particulate pollution in the region. In Addis Ababa, this substance is primarily generated by diesel vehicles, fires, and other combustion sources. By capturing these detailed measurements, the MAIA project aims to understand the specific composition of the air residents breathe.
Data from the sensors indicates that pollution levels in the city are not static but fluctuate significantly based on the time of day and the season. The monitoring has identified distinct spikes in particulate matter that correlate with rush-hour traffic and holiday celebrations, offering a granular view of how human activity impacts local air quality.
The findings from Addis Ababa are considered relevant to urban air quality challenges in cities around the world, including those in the United States. As PM2.5 is identified as one of the deadliest forms of air pollution, understanding its sources and patterns in a major African capital provides valuable context for global health researchers.
According to the 2025 State of Global Air Report, cited in the associated research, PM2.5 is linked to approximately 4.9 million excess deaths globally each year. Some of these particles are small enough to penetrate deep into the human body and enter the bloodstream, posing severe health risks to populations in densely populated areas.
Among the various types of PM2.5, black carbon has been specifically linked to adverse health outcomes. These include low birth weight, impaired brain development, respiratory conditions, and premature mortality, highlighting the critical need for precise monitoring of this particular pollutant.
