Shanghai Tower atmospheric CO2 and CO during 2021-2023

Continuous in-situ CO2 and CO measurements were conducted from 17 April 2021 to 6 March 2023 (a period of nearly two years) at the Shanghai Tower (SHT, 121.51°E, 31.23°N), an urban GHG monitoring site erected atop the world's second-tallest skyscraper. The sampling inlet was positioned at 632.0 m above ground level (a.g.l.); with the tower base at 5 m above mean sea level (a.s.l.), this corresponds to approximately 637 m a.s.l. This campaign yielded high-precision, in-situ data on CO2 and CO levels at the UCL top in metropolitan Shanghai, a key carbon emission hotspot in China.