ASTM D8559-24 pdf download,Standard Specification for Ambient Outdoor Air Quality Sensors and Sensor-Based Instruments for Portable and Fixed-Point Measurement. 1.1 This specification defines the performance standards for outdoor ambient air quality sensors, as outlined in Practice D8406. 1.2 This standard does not apply to sensors or devices that measure atmospheric pollutants through open paths, lidar, or imaging techniques. 1.3 This standard applies to sensors that can detect outdoor criteria pollutants in ambient air, including particulate matter (PM2.5 and PM10), sulfur dioxide (SO2), ozone (O3), carbon monoxide (CO), and nitrogen dioxide (NO2), at concentrations that are significant to public health. 1.4...