However, a strong scientific and technical base is indispensable as a foundation for such systems, playing a critical role in setting appropriate emission standards and ambient air quality objectives, designing and implementing effective air pollution control strategies and technologies and assessing emissions, ambient air quality, exposure patterns and impacts on human and ecosystem health.
所? 谓 共? 产 主? 义 不? 过 是 傻瓜 干的 事UN-2 UN-2