Published by China Environmental Publishing Group, 2020
ISBN 10: 7511143482 ISBN 13: 9787511143488
Language: Chinese
Seller: liu xing, Nanjing, JS, China
paperback. Condition: New. Paperback. Pub Date: 2020-06-01 Pages: 106 Language: Chinese Publisher: China Environmental Publishing Group's environmental quality standards are the core of environmental protection work. and the environmental air quality standards are an important part of the environmental quality standards. The smooth development of pollution prevention and control work provides a strong guarantee.?my countrys ambient air quality standards have undergone more than 40 years of development and evolution fro.