A Satellite View of Pollution on the Ground: Long-Term Changes in Global Nitrogen Dioxide

From monitoring harmful algal blooms to predicting the spread of infectious diseases, recent advances in satellite-based remote sensing have been a boon to environmental health science.1 In particular, the capacity to assess air quality from space is built on decades of work now beginning to pay dividends. This issue of EHP includes the first global estimate of long-term changes in ground-level nitrogen dioxide (NO2), offering a new tool for...