NASA MAIA roof-mounted sensor installed in Addis Ababa to monitor PM2.5

A roof‑mounted air sensor in Addis Ababa, Ethiopia’s capital, is part of a network of ten instruments deployed by NASA’s Multi‑Angle Imager for Aerosols (MAIA) to monitor the city’s atmospheric conditions. The sensors are positioned on high‑rise buildings to capture continuous measurements of fine particulate matter, specifically particles 2.5 micrometers or smaller in diameter (PM2.5), which are linked to a range of health risks worldwide.

MAIA’s sensors record the concentration and vertical distribution of PM2.5 across the metropolitan area, providing data that complement satellite observations and ground‑based monitoring stations. The Ethiopian Ministry of Environment, Forest and Climate Change partnered with NASA to install the devices, enabling local scientists to assess pollution sources, track seasonal variations, and evaluate the effectiveness of mitigation strategies. The detailed aerosol profiles generated by the network are expected to improve air‑quality forecasting models and inform public‑health advisories.

The deployment marks a significant step toward establishing a comprehensive, real‑time air‑quality monitoring system in Addis Ababa. By integrating the MAIA data with existing environmental programs, authorities aim to develop evidence‑based policies to reduce exposure to hazardous pollutants and enhance urban health outcomes. Continued operation of the sensor array will allow researchers to track long‑term trends and assess the impact of interventions on the city’s air quality.