.
Quality Issues South Asia South-East Asia Pacific Islands P.R. China Japan, Australia, and New Zealand
Pathogenic agents
1–3
1–2
2–3
1–3
0–1
Organic matter
1–3
0–2
0–1
1–3
0–1
Salinization
0–1
0–1
0–3
0–2
0–1
Nitrate
0–1
0–1
1–2
0–2
0–1
Fluoride
0–1
0
0
0–2
0
Eutrophication
0–1
0–3
0
0–2
0–1
Heavy metals
0–1
0–2
0–1
0–2
0–2
Pesticides
0–1
0–1
0–1
0–1
0–1
Sediment load
0–2
0–2
0–1
0–1
0–1
Acidification
0
0–1
0
0–1
0–1