Evolution of PM2.5 Measurements and Standards in the U.S. and Future Perspectives for China
Aerosol and Air Quality Research
National Ambient Air Quality Standards (NAAQS) were first established in the United States to protect public health and welfare, and the concept has been adopted in China and many other countries. For particulate matter (PM), the NAAQS indicator evolved from total particle mass concentration, to PM 10 and PM 2.5 mass concentrations as defined by the PM size-selective properties of the monitoring instrument and human inhalation characteristics. Particle measurements started with optical
... th optical microscopy in the early 18 th century, and scientific research over the past 300 years has related particles to adverse environmental and health effects. Several options for PM 2.5 measurement and assessment are available to China and other developing countries as they implement new PM 2.5 ambient air quality standards. Although much can be learned from the experience of North America and Europe, China can leapfrog ahead in terms of PM 2.5 monitoring and emission reduction technology. China-specific guidance documents should be created for network design, equipment selection and operation, quality control and quality assurance, database management, and interpretation. Future air quality management and standards will need to consider multiple pollutants and their effects on visibility, climate, materials, and ecosystems in addition to the primary concerns about public health.