Said Munir

  • The Custodian of the Two Holy Mosques Institute for Hajj and Umrah Research, Umm Al-Qura University, Makkah, P.O. Box 6287, Saudi Arabia

Received: February 18, 2016
Revised: May 7, 2016
Accepted: May 12, 2016
Download Citation: ||  

  • Download: PDF

Cite this article:
Munir, S (2017). Analysing Temporal Trends in the Ratios of PM2.5/PM10 in the UK. Aerosol Air Qual. Res. 17: 34-48.


  • PM2.5/PM10 ratios are analysed at 46 monitoring sites in the UK.
  • PM2.5/PM10 ratios showed considerable temporal and spatial variability in the UK.
  • PM2.5/PM10 ratios have increased at several sites in the UK during the study period.
  • However, trend averaged over 46 sites 2010–2014 was insignificant.
  • Diurnal, weekly and annual cycles of PM2.5, PM10 and their ratios are analysed.



The size of atmospheric Particulate Matter (PM) is important as a determining factor for how long the particle stays in the atmosphere, and where it deposits in the human respiratory tract. Therefore, it is important to analyse PM2.5/PM10 ratios as an indicator of the fine particles and determine how the ratios vary both in space and time. This study uses the most recent 5 years (2010–2014) PM2.5 and PM10 data (µg m–3) from 46 monitoring stations, which are part of the UK Automatic Urban and Rural Network (AURN). In this paper mostly robust statistics, which are not sensitive to non-normal distributions and to extreme values in both tails of the distributions are applied to assess temporal trends in PM2.5, PM10 and their ratios. PM2.5/PM10 ratios demonstrated considerable temporal and spatial variability in the UK and 5 years median ranged from 0.4 to 0.8, resulting in overall median of 0.65. Theil-Sen temporal trend analysis showed that PM2.5/PM10 ratios have increased at several monitoring sites in the UK despite the fact that both PM2.5 and PM10 levels have predominantly decreased. However, trend in PM2.5/PM10 ratios averaged over the 46 monitoring sites was insignificant. Trends in the ratios of PM2.5/PM10 varied during different seasons: spring showed positive significant trend and winter showed negative significant trend, whereas trends in autumn and summer were insignificant. For further investigations: (a) Trends are adjusted for meteorological effect; (b) The emissions of PM10 and PM2.5 (kilotonnes year–1) and their ratios from 1990 to 2013 are analysed; (c) Temporal trends of the secondary particles (nitrate and sulphate) are analysed from 2000 to 2014; and (d) The diurnal, weekly and annual cycles in the ratios of PM2.5 and PM10 are analysed.

Keywords: Fine Particulate Matter; PM10; PM2.5; PM2.5/PM10 ratio; Air Pollution

Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

77st percentile
Powered by
   SCImago Journal & Country Rank

2022 Impact Factor: 4.0
5-Year Impact Factor: 3.4

Call for Papers for the special issue on: "Carbonaceous Aerosols in the Atmosphere"

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.