Short-Term Exposure Sampling Exaggerates Environmental Inequality, Study Finds
· newswise.com · popularity 21/100 · 0 similar stories today · Social Science & Behavioral Research (Discovery & Research)
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Summary
Accurately assessing environmental exposure is central to environmental health research and equitable urban planning. Many studies infer long-term exposure from short-term global positioning system (GPS) or mobile signaling tracks lasting only days or weeks, treating these brief periods as representative of chronic conditions. This study conceptualizes that assumption as the temporal exposure averaging problem (TEAP). Using year-long mobile signaling records from 110,000 individuals in Shenzhen, researchers reconstructed daily mobility and calculated exposure to greenspace and multiple air pollutants. Short sampling windows produced large intraindividual deviations from annual exposure and inflated interindividual variability; exposure derived with longer windows converged toward full-year values and population means. The findings show that observation length shapes whether environmental exposure appears highly unequal or relatively averaged.
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