The U.S. EPA operates the Speciation Trends Network (STN), which has approximately 200 monitoring sites, mostly in urban areas.
For daily concentrations of PM2.5 mass, we used data from the U.S. EPA Air Quality System from 2000 to 2005, which included approximately 1,400 monitoring sites (Dominici et al. 2006; Peng et al. 2009).
We obtained PM2.5 constituent data for 2000 2005 from the U.S. Environmental Protection Agency EPA Chemical Speciation Networkrk, which records concentrations of > 50 chemical constituents that contribute to PM2.5 mass from approximately 250 monitoring sites throughout the continental United States (Bell et al. 2007; Peng et al. 2009).
The data covers damage classes 2 to 4 of all of the 7 016 single sites surveyed in 1985, together with tree age, soil and weather conditions and SO2 emission as well as SO4 and NO3 deposition at approximately 100 monitoring stations.
The 53 stations included in this study were selected by ARPA Lombardia from the approximately 200 monitors of the Regional Air Monitoring Network on the basis of their location, reliability, determined by standardized quality control procedures and by correlation with in situ measurements, and continuity of recording.
The robots behind the app monitor approximately 4,300 museums around the world.
However, approximately 15% more monitor units were delivered when planned on the Elekta machine (p < 0.002).
Fish were sampled approximately monthly to monitor growth and determine whole body lipid level, gender and the state of sexual maturation.
Expect to see a bevy of wearable devices, including a bandage-like patch from BodyMedia, a spinout from Carnegie Mellon's skunk works, that will monitor approximately 5,000 data points on its wearer.
And the Australian Institute of Sport AISS) has co-developed a database in which Australia's National Sporting Organisations closely monitor approximately 2,000 athletes each week.
