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Remote sensing of PM2.5 exposure and change in air pollution-related awareness measured by Google Trends in Asian megacities
Published:
17 April 2024
by MDPI
in OHOW 2023 – The 2nd International Symposium on One Health, One World
session International public health research in Asia
Abstract:
In recent years, air pollution mitigation policies have become stricter, but air pollution is still worsening in many areas. From this example, we hypothesize that public awareness of air pollution is a more important factor in mitigating air pollution than the strictness of air pollution mitigation policies. This study analyzed air pollution levels and public awareness of air pollution in Southeast and South Asia, where air pollution is severe, by comparing changes over time. Regarding air pollution levels, time-series data on PM2.5 pollution levels, which are the most harmful to the human body, were generated from MODIS products. As for the public awareness of air pollution, we obtained time-series data on the popularity of a search query meaning air pollution from GoogleTrends. These two time-series data were decomposed into seasonal, trend, and residual components by STL decomposition, and compared. As a result, it was found that time-series data on public awareness of air pollution is broadly classified into two patterns. The first is a consistently increasing pattern and the second is a temporary decline pattern. The U-shaped temporary decline in environmental awareness suggests the influence of new Google users. However, in many areas, the increase in public awareness of air pollution did not lead to an improvement in air pollution levels, and research on the relationship between mitigation policies and air pollution levels is warranted.
Keywords: public health; Asian megacity; public policy; MODIS; AirRGB; social sensing
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Air pollution is worsening despite stricter policies, highlighting the need for greater public awareness. A study in Southeast and South Asia analyzed PM2.5 levels and Google Trends data, revealing two awareness patterns: consistent increase and temporary decline. Interestingly, while awareness rose, it didn't correlate with improved air quality. Just like in the Slope Game, where navigating challenges requires awareness and strategy, tackling air pollution needs informed public engagement to drive real change.
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This study explores remote sensing of PM2.5 exposure and its impact on air pollution awareness, utilizing Google Trends across major Asian megacities. As cities evolve, staying informed is crucial. Just like in the Slope Game, where navigating sharp turns requires skill, adapting to changing air quality demands awareness and proactive measures.
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Ito and Takeuchi’s recent publication offers a compelling look at the disconnect between public sentiment and environmental reality. By utilizing "social sensing" via Google Trends to map PM2.5 awareness against actual pollution levels, the study validates a worrying trend: heightened anxiety does not automatically translate to improved air quality. The identified "U-shaped" pattern in awareness suggests that while digital populations in Asian megacities are reacting to environmental changes, the gap between awareness and effective policy mitigation remains a critical public health challenge.
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This study by Ito and Takeuchi presents a compelling analysis of the "awareness-action gap" in environmental health. By cleverly combining MODIS satellite data with Google Trends, the research highlights a sobering reality: in many Asian megacities, rising public concern about PM2.5 levels has not yet translated into tangible air quality improvements. It’s a powerful reminder that while "social sensing" can track public anxiety, solving complex urban pollution requires more than just awareness—it demands a fundamental shift in policy and systemic change.
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Ito and Takeuchi’s recent study offers a sobering reality check on the relationship between digital information and physical reality. By overlaying MODIS satellite data with Google Trends analytics, the authors identify a critical "awareness-action gap" in Asian megacities: while public consciousness of air pollution is rising (or fluctuating due to new internet users), this heightened awareness has not yet translated into tangible reductions in PM2.5 exposure. It suggests that while social sensing is a powerful diagnostic tool, awareness alone is insufficient to drive the structural changes needed for environmental health.
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