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Assessing Long-Term Trend of Particulate Matter Pollution in the Pearl River Delta Region Using Satellite Remote Sensing
journal contribution
posted on 2015-10-06, 00:00 authored by Ying Li, Changqing Lin, Alexis K. H. Lau, Chenghao Liao, Yongbo Zhang, Wutao Zeng, Chengcai Li, Jimmy C. H. Fung, Tim K. T. TseSerious particulate matter (PM) pollution
problems in many polluted
regions of China have been frequently reported in recent years. Long-term
exposure to ambient PM pollution is significantly associated with
adverse health effects. Characterizing the long-term trends and variation
in PM pollution is a basic requirement for evaluating long-term exposure
and for guiding future policies to reduce the effects of air pollution
on health. However, long-term, ground-based PM measurements are only
available at a few fixed stations. In this study, an algorithm is
developed and validated to estimate PM concentrations based on the
satellite atmospheric optical depth with 1 km spatial resolution.
The long-term trends of PM10 concentrations in the entire
Pearl River Delta (PRD) region and different cities are quantified
and discussed. From 2001 to 2013, the PM10 pollution of
the entire PRD region was dominated by a decreasing trend of −0.15
± 0.23 μg/m3·yr. This decreasing PM10 trend was apparent over 75% of the PRD area, with the most
significant decreases observed in the center of the region. However,
the remaining 25%, mostly located in the outskirts of the region,
showed an increasing PM10 trend. This overall decreasing
trend indicates the effectiveness of the control measures applied
in the past decade for the primary pollutants.
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PM 10 trend1 kmcontrol measuresPRD regionPearl River Delta RegionParticulate Matter Pollutionambient PM pollutionPearl River DeltaPM pollutionPM 10 pollutionpollution problemsSatellite Remote SensingSeriousPRD areaPM 10 concentrationsestimate PM concentrationsPM measurementshealth effectsair pollutionfuture policies
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