Remote sensing of ambient particles in Delhi and its environs: Estimation and validation

Naresh Kumar, A. Chu, A. Foster

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Recent advances in atmospheric remote sensing offer a unique opportunity to compute indirect estimates of air quality, particularly for developing countries that lack adequate spatial-temporal coverage of air pollution monitoring. The present research establishes an empirical relationship between satellite-based aerosol optical depth (AOD) and ambient particulate matter (PM) in Delhi and its environs. The PM data come from two different sources. Firstly, a field campaign was conducted to monitor airborne particles ≤2.5 μm and ≤10 μm in aerodynamic diameter (PM2.5 and PM10 respectively) at 113 spatially dispersed sites from July to December 2003 using photometric samplers. Secondly, data on eight hourly PM10 and total suspended particulate (TSP) matter, collected using gravimetric samplers, from 2000 to 2005 were acquired from the Central Pollution Control Board (CPCB). The aerosol optical depths were estimated from MODIS data, acquired from NASA's Goddard Space Flight Center Earth Sciences Distributed Active Archive Center from 2000 to 2005. Both the PM and AOD data were collocated by time and space: PM mass ± 150 min of AOD time, and ± 2.5 and 5 km radius (separately) of the centroid of the AOD pixel for the 5 and 10 km AOD, respectively. The analysis here shows that PM correlates positively with the 5 km AOD; a 1% change in the AOD explains 0.52% ± 0.20% and 0.39% ± 0.15% changes in PM2.5 within 45 and 150 min intervals (of AOD data) respectively. At a coarser spatial resolution, however, the relationship between AOD and PM is relatively weak. But, the relationship turns significantly stronger when monthly estimates are analysed over a span of six years (2000 to 2005), especially for the winter months, which have relatively stable meteorological conditions.

Original languageEnglish
Pages (from-to)3383-3405
Number of pages23
JournalInternational Journal of Remote Sensing
Volume29
Issue number12
DOIs
StatePublished - Jun 20 2008
Externally publishedYes

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optical depth
Aerosols
Remote sensing
aerosol
remote sensing
particulate matter
sampler
particle
Earth sciences
pollution monitoring
Pollution control
suspended particulate matter
Earth science
Space flight
Air pollution
Developing countries
Air quality
pollution control
MODIS
aerodynamics

ASJC Scopus subject areas

  • Computers in Earth Sciences

Cite this

Remote sensing of ambient particles in Delhi and its environs : Estimation and validation. / Kumar, Naresh; Chu, A.; Foster, A.

In: International Journal of Remote Sensing, Vol. 29, No. 12, 20.06.2008, p. 3383-3405.

Research output: Contribution to journalArticle

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