Preface

This proceeding includes original and peer-reviewed research papers from 2 nd International Conference on Air Pollution and Environmental Engineering (APEE 2019). APEE 2019 was held in Xi'an, China during December 15-16, 2019. Air pollution has become a major issue in China and other developing countries, it could become the biggest health threat. APEE 2019 is a platform for presenting excellent results and new challenges facing the field of the air pollution and environmental engineering. It brings together experts from industry, governments and academia, experienced in engineering, technology and research. To promote environmental protection and green sustainable development all over the world. APEE 2019 received 471 manuscripts, and 126 submissions had been accepted by our reviewers. By submitting a paper to APEE 2019, the authors agreed to the review process and understood that papers undergo a peer-review process. Manuscripts were reviewed by appropriately qualified experts in the field selected by the conference committees, who gave detailed comments and-if the submission was accepted the authors would submit a revised version that took into account this feedback. All papers were reviewed using a double-blind review process: authors declared their names and affiliations in the manuscript for the reviewers to see, but reviewers did not know each other’s identities, nor did the authors receive information about who had reviewed their manuscript. The Committees of APEE 2019 invested great efforts in reviewing the papers submitted to the conference and organizing the sessions to enable the participants to gain maximum benefit. Hopefully, all participants and other interested readers will benefit scientifically from the proceedings and also find it stimulating in the process.