Formaldehyde (HCHO) is a key atmospheric indicator of air pollution. The new TEMPO (Tropospheric Emissions: Monitoring of Pollution) satellite instrument provides hourly measurements of HCHO across North America. To check how accurate these measurements are, Ortega et al. compared them with ground-based data from two instruments, Fourier Transform InfraRed (FTIR) and Pandora, at sites in Boulder, Mexico City, and Toronto, where these instruments are co-located. They found good agreement between FTIR and Pandora, especially when Pandora instruments are properly calibrated. Using both data sets, they evaluated TEMPO and found that it consistently underestimates HCHO by about 30%, but it successfully captures daily pollution patterns. This highlights the value of combining satellite and ground-based data to improve air quality monitoring.