Taipei's river chemistry improved, but bacteria did not follow the same trajectory
WHAT THE EVIDENCE SAYS
A non-parametric analysis of 1,921 monthly water samples from 11 stations found falling suspended solids at nine stations, ammonia at eight and five-day biochemical oxygen demand at six. Mean River Pollution Index fell from 3.83 to 3.20, but a coliform countertrend and uneven dissolved oxygen responses complicated the aggregate improvement story.
WHY IT MATTERS / OUR READ
Different pollutant classes call for different actions; a composite score or expanded sewer connection does not on its own certify ecological or sanitary recovery.
CAVEATS / UNCERTAINTY
Time trends and change points are not causal attribution to wetlands or sewer work. The incomplete 2026 record was excluded from early-versus-late comparisons.
SOURCE
Frontiers in Ecology and Evolution — primary long-term river-water analysis
View original evidence ↗
A 2010–2025 station record showed declines in several pollution metrics even as the coliform indicator rose between early and late survey windows.
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