Letter from the UNEA President informing of the appointment of Ms. Purvaja Ramachandran as co-chair of UNEP's Working Group on Nitrogen (13 Jan 2023)
![[current-page:title]](https://cdn.unenvironment.org/s3fs-public/default_images/placeholder_2.jpg "[current-page:title]")
Letter from the UNEA President informing of the appointment of Ms. Purvaja Ramachandran as co-chair of UNEP's Working Group on Nitrogen (13 Jan 2023)
只有12％的城市，其空气质量符合世卫组织的标准。