CnOpenData China's seawater quality monitoring data

The ocean is one of the largest ecosystems on Earth and has an extremely important impact on the survival of species around the world. However, in recent years, the ocean has faced serious pollution problems, posing a huge threat to the ecosystem and human health, especially in coastal waters.

**The water quality of coastal waters is an important indicator for evaluating the quality of the ecological environment in coastal waters. **In recent years, with the continuous advancement of the protection and construction of "Beautiful Bays", the water quality of my country's coastal waters has been stable and improving. According to relevant departments, in 2021, the area of my country's coastal waters that met the national Class I and Class II seawater quality standards accounted for 81.3%, Class III seawater accounted for 5.2%, and Class IV and Class IV-minus seawater accounted for 13.5%. The water quality of some estuaries and bays entering the sea still needs to be improved.

With the continuous improvement of the concept of ecological civilization in the whole society, the importance of strictly controlling and improving the water quality of coastal waters has become increasingly prominent. Against this background, CnOpenData launched China's seawater quality monitoring data, including various indicators of nearshore water quality monitoring within 2017, to help related research.

Time interval

2017-2023

Field display

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China's seawater quality monitoring data field table
Year
Sea area
Province
Prefecture-level city
Point code
Measured longitude
Measured latitude
Detection time
pH (dimensionless)
Dissolved oxygen (mg/L)
Chemical oxygen demand (mg/L)
Inorganic nitrogen (mg/L)
Active phosphate (mg/L)
Petroleum (mg/L)
Water quality category

Sample data< /h2> < td>39.4 < td>0.014 tr> < tr> < td>1.16 < td>Liaoning d> < td>May 2017 < td>Class I9.34 9.56 H21YQ504 H21YQ013 Yellow Sea < td>0.06539.26 0.84 < tr> 121.25 td> 0.02 td> < /tr>

Year Sea area Province City Point code Measured longitude Measured latitude Test time pH (dimensionless) Dissolved oxygen (mg/L) Chemical oxygen demand (mg/L) Inorganic nitrogen (mg/L) Active phosphate (mg/L) Petroleum (mg/L) Water quality category

2017 Yellow Sea Liaoning Dandong H00JQ007 123.59 May 2017 8.13 9.71 0.71 0.132 0.003 0.006 Class 1

2017 Yellow Sea Liaoning Dandong H00JQ510 124.02 39.53 May 2017 8.12 9.42 0.8 0.13 0.001 Class I

2017 Yellow Sea Liaoning Dandong H21YQ501 123.65 39.74 May 2017 8.12 8.6 0.9 6 0.088 0.001 0.02 8 Class I

2017 Yellow Sea Liaoning Dandong H21JQ508 123.83 39.54 May 2017 8.08 9.24 0.68 0.662 0.003 0.004 Fourth Class Poor

2017 Yellow Sea Liaoning Dandong H21YQ008 123.67 39.79 May 2017 8.12 8.27 1.16 0.162 0.001 0.021 Class 1

2017 Yellow Sea Liaoning Dandong H21YQ512 123 .93 39.81 May 2017 8.03 8.07 1.32 0.043 0.005 0.049 Class 1
2017 Yellow Sea Liaoning Dandong H21YQ514 123.61 39.57 May 2017 8.07 8.86 0.76 0.117 0 .012 0.019 Class I
2017 Yellow Sea Liaoning Dandong H21ZQ001 124.2 39.85 May 2017 7.95 8.21 1.24 0.653 0.009< /td> 0.02 Fourth Class Poor

2017 Yellow Sea Liaoning Dandong H21ZQ002 124.17 39.8 May 2017 8.09 9.1 0.381 0.002 0.036 Class III

2017 Yellow Sea Liaoning Dandong H21ZQ003 124.1 39.8 2017 May 8.16 7.94 2.28 0.542 0.019 0.033 Poor Category 4

2017 Yellow Sea Dandong H21ZQ004 124.15 39.77 May 2017 8 8.53 1.68 0.555 0.005 0.019 Class IV inferior

2017 Yellow Sea Liaoning Dandong H21ZQ005 124.07 39.76 May 2017 8.22 9.47 1.28 0.399 0.002 0.017 Three categories

2017 Yellow Sea Liaoning Dandong H21ZQ006 124.13 39.71 May 2017 8.17 9.78 1.24 0.413 0.001 0.016 Four categories

2017 Yellow Sea Liaoning Dandong H21ZQ007 124 39.69 May 2017 8.12 9.44< /td> 0.96 0.251 0.005 0.009 Class II

2017 Bohai Liaoning Dalian B21 YQ510 121.2 39.14 8.17 9.56 1.04 0.02 0.003 0.025 Class I

2017 Bohai Liaoning Dalian B21YQ00 3 121.4 39.13 May 2017 8.13 8.82 0.55 0.079 0.006 0.025

2017 Yellow Sea Liaoning Dalian H21YQ030 121.51 38.82 May 2017 8.02 5.12 1.45 0. 472 0.027 0.025 Four categories

2017 Yellow Sea Liaoning Dalian H21ZQ014 121.77 39 May 2017 8.11 1.05 0.099 0.004 0.053 Category 3

2017 Yellow Sea Liaoning Dalian H21ZQ016 121.68 38.9 9 May 2017 8.14 0.86 0.084 0.004 0.041 Class I

2017 Bohai Liaoning Dalian B21YQ002 121.54 39.13 May 2017 8.14 6.66 0.68 0.079 0.02 0.023 Class II

2017 Bohai Liaoning Dalian B21YQ004 121.5 39.13 May 2017 8.14 8.2 0.63 0.093 0.012 0.016 Class I

2017 Bohai Liaoning Dalian B21YQ033 121.32 39 May 2017 8.11 8.53 0.62 0.085 0.021 0.024 Class II

2017 Yellow Sea Liaoning Dalian H21YQ516 122.25 38.98 May 2017 8.2 9.6 0.74 0.022 0.002 0.004 Class I

2017 Yellow Sea Liaoning Dalian H21YQ503 121.99 38.92 May 2017 8.11 10.4 0.7 0.199 0.008 0.051 Class III

2017 Yellow Sea Liaoning Dalian 122.21 39 .16 May 2017 8.09 8.9 0.71 0.09 0.004 0.037 Class 1

2017 Yellow Sea Liaoning Dalian 122 39.07 May 2017 8.08 9.23 0.65 0.115 0.007 0.0 31 Class I

2017 Liaoning Dalian H21YQ026 122.18 39.22 May 2017 8.06 8.8 0.74 0.008 0.042 Class I

2017 Yellow Sea Liaoning Dalian H21YQ032 121.94 39.03 May 2017 8. 11 9.26 1.18 0 .166 0.017 0.054 Class III

2017 Bohai Liaoning Dalian B21YQ005 121.67 39.34 May 2017 8 6.33 1.74 0.591 0.005 0.025 Inferior to Category 4

2017 Bohai Liaoning Dalian B21YQ034 121.52 May 2017 8.11 8.54 0.81 0.08 0.005 0.019 Class 1

2 017 Bohai Liaoning Dalian B21YQ521 121.08 39.09 May 2017 8.24 10.81 0.98 0.02 0.002 0.025 Class I

201 7 Bohai Liaoning Dalian B21YQ522 120.88 38.99 May 2017 8.26 10.59 0.018 0.002 0.037 Class I

2017 Bohai Liaoning Dalian H00JQ509 121.1 38.51 May 2017 8.25 10.29 1.02< /td> 0.022 0.002 Not detected Class I

2017 Yellow Sea Liaoning Dalian H21JQ511 121.43 38.61 May 2017 8.21 9.09 0.7 0.023 0.003 0.005 Class 1

2017 Bohai Liaoning Dalian B21YQ001 121.1 1 38.75 May 2017 8.19 10.3 0.63 0.075 0.01 0.026 Class 1
2017 Bohai Liaoning Dalian B21YQ032 121.09 38.88 May 2017 8.22 10.8 0.65 0.103 0. 01 0.019 Class 1

2017 Bohai Liaoning Dalian B21YQ511 120.94 38.78 May 2017 8.21 9.13 0.68 0.069 0.007 0.024 Class I

2017 Yellow Sea Liaoning Dalian H21YQ502 121.3 38.69 2017 May 8.23 10.4 0.71 0.064 0.009 0.031 Class I

2017 Bohai Liaoning Dalian H21YQ522 121.15 38.72 2017 May 2017 8.19 10.8 0.68 0.117 0.01 0.03 Class I

2017 Yellow Sea Liaoning Dalian H21YQ022 38.78 May 2017 8.23 11.1 0.73 0.082 0.008 0.019 Class 1

2017 Yellow Sea Liaoning Dalian H21YQ031 121.4 38.82 May 2017 8.1 7.01 0.79 0.14 0.06 Three categories

2017 Yellow Sea Liaoning Dalian H21YQ012 122.37 39.35 May 2017 8.2 9.12 0.54 0.012 0.002 0.01 Class I

2017 Yellow Sea Liaoning Dalian H21YQ517 121.57 38.67 May 2017 8.22 9.26 0.7 0.029 0.002 Not detected Class I

2017 Yellow Sea Liaoning Dalian H21YQ021 121.57 38.87 2017 May 2017 8.16 10.3 0.87 0.168 0.006 0.02 Class I

2017 Bohai Liaoning Dalian B21YQ508 121.11 39.5 May 2017 8.19 9.55 0.99 0.027 0.003 0.035 Class 1

2017 Bohai Liaoning Dalian B21YQ509 121.17 39.33 May 2017 8.18 9.59 0.94 0.027 0.003 0.025 Class 1
2017 Bohai Liaoning Dalian B21YQ507 121.14 39.74 May 2017 8.19 9.84 0.65 0.038 0.004 0.029 Class I

2017 Bohai Liaoning Dalian B21JQ031 121.47 39.94 May 2017 8.12 9.0 8 0.8 0.095 0.004 0.012 Class I

2017 Bohai Liaoning Dalian B2 1YQ007 121.49 39.67 May 2017 8.05 7.79 1.09 0.051 0.009 0.013 Class I

Year	Sea area	Province	City	Point code	Measured longitude	Measured latitude	Test time	pH (dimensionless)	Dissolved oxygen (mg/L)	Chemical oxygen demand (mg/L)	Inorganic nitrogen (mg/L)	Active phosphate (mg/L)	Petroleum (mg/L)	Water quality category
2017	Yellow Sea	Liaoning	Dandong	H00JQ007	123.59	May 2017	8.13	9.71	0.71	0.132	0.003	0.006	Class 1
2017	Yellow Sea	Liaoning	Dandong	H00JQ510	124.02	39.53	May 2017	8.12	9.42	0.8	0.13	0.001	Class I
2017	Yellow Sea	Liaoning	Dandong	H21YQ501	123.65	39.74	May 2017	8.12	8.6	0.9 6	0.088	0.001	0.02 8	Class I
2017	Yellow Sea	Liaoning	Dandong	H21JQ508	123.83	39.54	May 2017	8.08	9.24	0.68	0.662	0.003	0.004	Fourth Class Poor
2017	Yellow Sea	Liaoning	Dandong	H21YQ008	123.67	39.79	May 2017	8.12	8.27	1.16	0.162	0.001	0.021	Class 1
2017	Yellow Sea	Liaoning	Dandong	H21YQ512	123 .93	39.81	May 2017	8.03	8.07	1.32	0.043	0.005	0.049	Class 1
2017	Yellow Sea	Liaoning	Dandong	H21YQ514	123.61	39.57	May 2017	8.07	8.86	0.76	0.117	0 .012	0.019	Class I
2017	Yellow Sea	Liaoning	Dandong	H21ZQ001	124.2	39.85	May 2017	7.95	8.21	1.24	0.653	0.009< /td>	0.02	Fourth Class Poor
2017	Yellow Sea	Liaoning	Dandong	H21ZQ002	124.17	39.8	May 2017	8.09	9.1	0.381	0.002	0.036	Class III
2017	Yellow Sea	Liaoning	Dandong	H21ZQ003	124.1	39.8	2017 May	8.16	7.94	2.28	0.542	0.019	0.033	Poor Category 4
2017	Yellow Sea	Dandong	H21ZQ004	124.15	39.77	May 2017	8	8.53	1.68	0.555	0.005	0.019	Class IV inferior
2017	Yellow Sea	Liaoning	Dandong	H21ZQ005	124.07	39.76	May 2017	8.22	9.47	1.28	0.399	0.002	0.017	Three categories
2017	Yellow Sea	Liaoning	Dandong	H21ZQ006	124.13	39.71	May 2017	8.17	9.78	1.24	0.413	0.001	0.016	Four categories
2017	Yellow Sea	Liaoning	Dandong	H21ZQ007	124	39.69	May 2017	8.12	9.44< /td>	0.96	0.251	0.005	0.009	Class II
2017	Bohai	Liaoning	Dalian	B21 YQ510	121.2	39.14	8.17	9.56	1.04	0.02	0.003	0.025	Class I
2017	Bohai	Liaoning	Dalian	B21YQ00 3	121.4	39.13	May 2017	8.13	8.82	0.55	0.079	0.006	0.025
2017	Yellow Sea	Liaoning	Dalian	H21YQ030	121.51	38.82	May 2017	8.02	5.12	1.45	0. 472	0.027	0.025	Four categories
2017	Yellow Sea	Liaoning	Dalian	H21ZQ014	121.77	39	May 2017	8.11	1.05	0.099	0.004	0.053	Category 3
2017	Yellow Sea	Liaoning	Dalian	H21ZQ016	121.68	38.9 9	May 2017	8.14	0.86	0.084	0.004	0.041	Class I
2017	Bohai	Liaoning	Dalian	B21YQ002	121.54	39.13	May 2017	8.14	6.66	0.68	0.079	0.02	0.023	Class II
2017	Bohai	Liaoning	Dalian	B21YQ004	121.5	39.13	May 2017	8.14	8.2	0.63	0.093	0.012	0.016	Class I
2017	Bohai	Liaoning	Dalian	B21YQ033	121.32	39	May 2017	8.11	8.53	0.62	0.085	0.021	0.024	Class II
2017	Yellow Sea	Liaoning	Dalian	H21YQ516	122.25	38.98	May 2017	8.2	9.6	0.74	0.022	0.002	0.004	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ503	121.99	38.92	May 2017	8.11	10.4	0.7	0.199	0.008	0.051	Class III
2017	Yellow Sea	Liaoning	Dalian	122.21	39 .16	May 2017	8.09	8.9	0.71	0.09	0.004	0.037	Class 1
2017	Yellow Sea	Liaoning	Dalian	122	39.07	May 2017	8.08	9.23	0.65	0.115	0.007	0.0 31	Class I
2017	Liaoning	Dalian	H21YQ026	122.18	39.22	May 2017	8.06	8.8	0.74	0.008	0.042	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ032	121.94	39.03	May 2017	8. 11	9.26	1.18	0 .166	0.017	0.054	Class III
2017	Bohai	Liaoning	Dalian	B21YQ005	121.67	39.34	May 2017	8	6.33	1.74	0.591	0.005	0.025	Inferior to Category 4
2017	Bohai	Liaoning	Dalian	B21YQ034	121.52	May 2017	8.11	8.54	0.81	0.08	0.005	0.019	Class 1
2 017	Bohai	Liaoning	Dalian	B21YQ521	121.08	39.09	May 2017	8.24	10.81	0.98	0.02	0.002	0.025	Class I
201 7	Bohai	Liaoning	Dalian	B21YQ522	120.88	38.99	May 2017	8.26	10.59	0.018	0.002	0.037	Class I
2017	Bohai	Liaoning	Dalian	H00JQ509	121.1	38.51	May 2017	8.25	10.29	1.02< /td>	0.022	0.002	Not detected	Class I
2017	Yellow Sea	Liaoning	Dalian	H21JQ511	121.43	38.61	May 2017	8.21	9.09	0.7	0.023	0.003	0.005	Class 1
2017	Bohai	Liaoning	Dalian	B21YQ001	121.1 1	38.75	May 2017	8.19	10.3	0.63	0.075	0.01	0.026	Class 1
2017	Bohai	Liaoning	Dalian	B21YQ032	121.09	38.88	May 2017	8.22	10.8	0.65	0.103	0. 01	0.019	Class 1
2017	Bohai	Liaoning	Dalian	B21YQ511	120.94	38.78	May 2017	8.21	9.13	0.68	0.069	0.007	0.024	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ502	121.3	38.69	2017 May	8.23	10.4	0.71	0.064	0.009	0.031	Class I
2017	Bohai	Liaoning	Dalian	H21YQ522	121.15	38.72	2017 May 2017	8.19	10.8	0.68	0.117	0.01	0.03	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ022	38.78	May 2017	8.23	11.1	0.73	0.082	0.008	0.019	Class 1
2017	Yellow Sea	Liaoning	Dalian	H21YQ031	121.4	38.82	May 2017	8.1	7.01	0.79	0.14	0.06	Three categories
2017	Yellow Sea	Liaoning	Dalian	H21YQ012	122.37	39.35	May 2017	8.2	9.12	0.54	0.012	0.002	0.01	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ517	121.57	38.67	May 2017	8.22	9.26	0.7	0.029	0.002	Not detected	Class I
2017	Yellow Sea	Liaoning	Dalian	H21YQ021	121.57	38.87	2017 May 2017	8.16	10.3	0.87	0.168	0.006	0.02	Class I
2017	Bohai	Liaoning	Dalian	B21YQ508	121.11	39.5	May 2017	8.19	9.55	0.99	0.027	0.003	0.035	Class 1
2017	Bohai	Liaoning	Dalian	B21YQ509	121.17	39.33	May 2017	8.18	9.59	0.94	0.027	0.003	0.025	Class 1
2017	Bohai	Liaoning	Dalian	B21YQ507	121.14	39.74	May 2017	8.19	9.84	0.65	0.038	0.004	0.029	Class I
2017	Bohai	Liaoning	Dalian	B21JQ031	121.47	39.94	May 2017	8.12	9.0 8	0.8	0.095	0.004	0.012	Class I
2017	Bohai	Liaoning	Dalian	B2 1YQ007	121.49	39.67	May 2017	8.05	7.79	1.09	0.051	0.009	0.013	Class I

Data update frequency

Annual update

Time interval

Field display

Data update frequency

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