Figure 1
From: Diversity, abundance and activity of ammonia-oxidizing microorganisms in fine particulate matter
Map showing the sampling orders and sampling sites in Beijing-Tianjin-Hebei (BTH) megalopolis, China.
(Figure created by the authors using MapInfo Pro v15.2 free trial, http://www.pitneybowes.com/us/miprov15-2.html and Microsoft Office 2013, https://products.office.com/zh-cn/buy/office. The photos in the figure were taken by the authors).
