Many long-term monitoring sites in Antarctic regions, which deploy ground-based stratospheric remote sensors and fly radiosondes or ozonesondes on balloons, supported the Airborne Polar Experiment in September and October 1999.
These pollutants have longer time series of data at many more regulatory monitoring sites than those of PM2.5 components in NPACT.
PM10 concentrations are routinely measured at many ambient air monitoring sites across greater London using Tapered Element Oscillating Microbalance (TEOM; Rupprecht & Patashnick model 1400A, New York) monitors; data from 66 sites were available for this analysis.
For many of NEON's 80-plus monitoring sites, getting the necessary permits to begin work was the biggest hurdle.
Large-scale contaminated sites with multiple contaminants in the groundwater present a challenge to risk assessment (Heidrich et al. 2004; Heidrich 2004) and an economic burden at many industrial as well as urban groundwater monitoring sites (UIZ 2015).
For many of the National Ecological Observatory Network's (NEON's) 80-plus monitoring sites, getting the necessary permits to begin construction was the biggest hurdle.
59 60 Secondly, many studies measured concentrations of air pollution at remote monitoring sites, and it is therefore likely there will be some degree of misclassification of exposure.
Pollution levels in London are in fact lower than in many other world cities: average levels of nitrogen dioxide (NO2) from monitoring sites near busy roads in Stuttgart, Paris, Munich, Rome and Milan are all higher than those recorded for London.
Many previous studies to assess health effects of air pollutants have used exposure data from the nearest available monitor (often existing state or federally mandated monitoring sites).
More than 400 monitoring sites measured PM2.5.
