Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Apr 17;391(10135):2140–2184. doi: 10.1016/S0140-6736(18)30486-0

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2018 Elsevier Ltd. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

PMC Copyright notice

Annual concentrations of major pollutants in 31 major cities, 2003–12

Theil-Sen estimator and corresponding 95% CIs are represented by dots and lines. Source: data for PM_2·5 were obtained from satellite-derived products and other data were from China Statistical Yearbook of Environment 2003–12.⁸¹ PM_2·5=particulate matter with a diameter of less than 2·5 μm. PM₁₀=particulate matter with a diameter of less than 10 μm.