- 可入肺颗粒物 kěrùfèikēlìwù fine particulate matteratmospheric particulate matter with a diameter of less than 2.5 micrometers that can enter the lungs
- 可吸入颗粒物 kěxīrùkēlìwù breathable particulate matterTiny particles floating in the air that can be inhaled into the human respiratory system; a major air pollutant typically under 10 micrometers in diameter.
- 总悬浮颗粒物 zǒngxuánfúkēlìwù total suspended particulatesThe total amount of solid or liquid particles suspended in the air or water that do not easily settle; its concentration in the air is a key indicator for monitoring air quality.
- 细颗粒物 xìkēlìwù fine particulate matterFine air pollutants consisting of particles with a diameter of 2.5 micrometers or less; a key indicator of air quality also known as PM2.5.
- 颗粒物质 kēlìwùzhì particulate matterMasses of solid particles larger than one micron, often produced by fuel combustion or industrial processes, and a major source of air pollution