There are apartment buildings called "NOX Apartments" in Gatineau, QC, Canada.
NOx represents a family of 7 compounds (N2O, NO, N2O2, N2O3, NO2, N2O4, N2O5). Chronic exposure to NO2 can cause respiratory effects including airway inflammation in healthy people and increased respiratory symptoms. NO2 creates ozone (O3) which causes eye irritation and exacerbates respiratory conditions.