Volume 12 Number 1 (Jan. 2021)

Article#	Title & Authors	Page
1310	What does the Shinyei PPD42NS Low-Cost Dust Sensor Really Measure? by Michaël Canu, Boris Gálvis, and Malika Madelin	1
1311	Assessment of Soil Loss Rates in Asreh Watershed (North Jordan Badia) Using RUSLE and GIS by Saad M. AlAyyash	10
1312	Impact of 17β-Estradiol on Natural Water’s Heterotrophic Nitrifying Bacteria by Ziyi Dong, Changhao Xiao, Weihua Zeng, and Jinbo Zhao	17
1313	Diatomite Chemical Activation for Effective Adsorption of Methylene Blue Dye from Model Textile Wastewater by Parisa Ebrahimi and Anand Kumar	23
1314	Study the Level of Air Pollution from Al Hassan Industrial Estate in Irbid-Jordan by Sana’a Odat	29