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Air pollution has adverse effects on human health, but is challenging to routinely monitor in cities. Earth observations of atmospheric composition provide complete coverage of cities, but require validation with ground-based observations and interpretation with a detailed chemical transport model (CTM). We present first steps to use long-term (2005-2017) Earth observations to estimate trends in air pollution in 4 cities at different stages of development: London (developed) and Birmingham (urban renewal) in the UK, and New Delhi (semi-developed) and Kanpur (developing) in India. We estimate the same decline in NO 2 in London and Birmingham of 3.4% a-1 from Ozone Monitoring Instrument (OMI) tropospheric columns of NO 2. This is a steeper trend than is estimated with surface NO 2 observations in London (< 2% a-1) and with the UK Environment Agency air quality model for Birmingham (< 2% a-1). We will …