Spatiotemporal characteristics of PM_2.5 and PM₁₀ at urban and corresponding background sites in 23 cities in China.

ABSTRACT: Air pollution episodes in China are frequent and a more comprehensive understanding of pollution sources and impacts is needed to design appropriate strategies and set emission reduction targets. This study analyzes PM_2.5 and PM₁₀ concentrations measured in 23 cities at 178 urban sites and at 23 corresponding "urban contrast" sites in China with the goals of understanding spatial and temporal trends and quantifying the regional component of PM pollution. The contrast sites, located an average of 29km from cities in the upwind direction, are intended to represent "background" levels. Using daily measurements from April 2013 to March 2014, we assess compliance with air quality standards, PM_2.5/PM₁₀ ratios and urban "increments," defined as the incr

SUBMITTER: Xu L 

PROVIDER: S-EPMC5975381 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature