From: The analysis of groundwater nitrate pollution and health risk assessment in rural areas of Yantai, China
Water type
Nitrate nitrogen content (mg/L)
Number of samples
Qualified rate(%)
Dry season
21.6 ± 18.1
1174
48.98
Wet season
22.2 ± 18.2
46.76
total
21.9 ± 18.3
2348
48.59