Space4Good and World Bank collaborate on the Big Data NO2 Socio-Economic Observatory With the slowing of human mobility - and as a result, economic activity - across the globe due to the COVID-19 pandemic, air pollution has declined significantly in several countries, namely China, Italy, South Korea, and the United Kingdom (Figure 1). Figure 1. Nitrogen Dioxide emissions over China December through March 2020. Source: European Space Agency (ESA). Full animation available her