However, four northeastern provinces where the study cities were located showed a trend towards increased surface coverage by A. desertorum zonation over 10 years (Shenyang in Liaoning from 75 to 330 km 2 , Taiyuan in Shanxi from 60 to 317 km 2 , Shijiazhuang in Hebei from 98 to 285 km 2 , and Zhengzhou in Henan 43–135 km 2 ).
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Environmental and sensitization variations among asthma and/or rhinitis patients between 2008 and 2018 in China.
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Several central provinces (Wuhan in Hubei from 5 to 36 km 2 , Changsha in Hunan from 10 to 25 km 2 ) also showed a slight trend to an extended planting area, while one location showed a decrease trend in coverage (Chengdu in Sichuan from 41 to 22 km 2 ; Figure 4A and B ).