This guidance and tools presented here represent an effort to address this yawning gap between reality and aspirations for better air quality – in a stepwise approach that advances progress on Sustainable Development Goal (SDG) 11 – “Make cities and human settlements inclusive, safe, resilient and sustainable.”

链接地址：https://iris.who.int/bitstream/handle/10665/373134/9789240074446-eng.pdf?sequence=1&isAllowed=y