... of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/ . Trace gas Long-term trends Detection...

... sample polluted air from the European boundary layer air. Thus, they can only reflect the lower free tropospheric O 3 , and their long-term trends can be influenced by the signal of the European PBL air masses. Indeed, despite what was observed at the European mountain sites, by exploiting the IAGOS...

... distributions and long-term trends of ozone metrics relevant for climate change, human health, and vegetation. However, only few results are available in TOAR for China due to limited long-term ozone observations. Here, we present an integrated analysis of long-term measurements of surface ozone from eight...