Exposure Monitoring of Nitrogen Dioxide: An International Pilot Study Within the WHO/UNEP Human Exposure Assessment Location (HEAL) Programme

The UNEP/WHO Human Exposure Assessment Locations (HEAL) project was developed as part of the WHO Health-Related Monitoring Programme, which was started in 1973 and originally comprised urban air monitoring, water quality monitoring and food contamination monitoring. These three monitoring projects form part of the Global Environment Monitoring System (GEMS).