Summary of Ambient Air Monitoring (Summer)
Starting from 2010
| Parameters | Hong Kong Air Quality Objective (before Jan 2014) |
Baseline |
Monitoring Results | |||
|---|---|---|---|---|---|---|
|
1992 |
2010 | 2011 | 2012 | 2013 | ||
| 24 hr. Average |
Sep | Jul | Jul | Jul | Jul | |
|
Sulphur Dioxide (SO2) ug/m3 |
350 | 5-19 | 5.2-7.0 | 2.6-3.3 | 2.6-6.4 | 4.3-6.1 |
|
Nitrogen Dioxide (NO2) ug/m3 |
150 | 21-46 | 19.6-32.8 | 6.2-34.1 | 9.1-43.4 | 30.7-57.6 |
|
Total Suspended Particulates (TSP) ug/m3 |
260 | 38-52 | 34-49 | 29-112 | 20-33 | 26-41 |
|
Respirable Suspended Particulates (RSP) ug/m3 |
180 | 23-27 | 23-36 | 21-62 | 12-24 | 12-27 |
|
Nitrogen Oxides (NOx) ug/m3 |
--- | 33-90 | 46.1-69.9 | 30.1-48.2 | 23.7-86.0 | 48.6-83.5 |
|
Non-methane Hydrocarbons (NMHC) mg/m3 |
--- | 0.1-1.3 | 0.33-0.46 | 0.4-2.8 | 1.66-3.22 | 2.32-11.46 |
|
PCBs (total) ng/m3 |
--- | 3 | ND | ND | ND | ND |
|
Dioxins (total) pg/m3 |
--- | 0.084 | 0.037 | 0.010 | 0.010 | 0.022 |
|
VOCs (total) ug/m3 |
--- | 104.1 | 20.21 | 5.17 | 3.37 | 3.60 |
|
Prevailing Wind Direction |
--- | SW | SW | W-SW | W-SW | E-SE |
| Parameters | Hong Kong Air Quality Objective (since Jan 2014) |
Baseline |
Monitoring Results | |||||||
|
1992 |
2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
| 24 hr. Average |
Sep | Jul | Jul | Jun-Jul | Jul | Jul | Jul | Jul | Jul | |
|
Sulphur Dioxide (SO2) ug/m3 |
125 | 5-19 | 6.0-17.1 | 2.6-5.9 | 5.5-9.2 | 4.5-12.3 | 9.3-15.1 | 5.2-11 | 5.0-5.5 | 6.0-7.9 |
|
Nitrogen Dioxide (NO2) ug/m3 |
--- | 21-46 | 17.9-37.4 | 39.7-71.6 | 19.3-39.6 | 87.4-95.6 | 44.2-71.3 | 50.4-71 | 57.6-61.7 | 56.5-62.3 |
|
Total Suspended Particulates (TSP) ug/m3 |
--- | 38-52 | 30-57 | 33-52 | 27-39 | 129.3-149.8 | 35-86 | 40-56 | 37-49 | 53-69 |
|
Respirable Suspended Particulates (RSP) ug/m3 |
100 | 23-27 | 23-45 | 23-39 | 17-30 | 16-19 | 21-52 | 29-48 | 17-27 | 29-40 |
|
Nitrogen Oxides (NOx) ug/m3 |
--- | 33-90 | 22.1-62.3 | 56.8-90.5 | 42.6-56.0 | 22-31 | 63-97.8 | 75.5-107.8 | 88.6-92.5 | 80.1-92.6 |
|
Non-methane Hydrocarbons (NMHC) mg/m3 |
--- | 0.1-1.3 | 7.66-10.64 | 2.19-6.15 | 0.87-6.76 | 1.82-3.00 | 1.59-3.45 | 0.57-1.93 | 1.33-1.87 | 1.23-1.72 |
|
PCBs (total) ng/m3 |
--- | 3 | ND | ND | ND | ND | ND | ND | ND | ND |
|
Dioxins (total) pg/m3 |
--- | 0.084 | 0.022 | 0.010 | 0.009 | 0.010 | 0.009 | 0.027 | 0.156 | 0.025 |
|
VOCs (total) ug/m3 |
--- | 104.1 | 1.76 | ND | ND | 103.56 | 22.92 | 1.03 | ND | ND |
|
Prevailing Wind Direction |
--- | SW | SW | S | S | E-SW | E-SE | SE | SW | E-SE |
| Parameters | Hong Kong Air Quality Objective(since Jan 2022) | Baseline | Monitoring Results | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | 2022 | 2023 | 2024 | |||||||
| 24 hr. Average | Jul | Jul | Jul | Jul | ||||||
| Sulphur Dioxide (SO2) ug/m3 | 50 | 5.0-5.5 | 6.4-8.8 | 6.5-7.3 | 4.1-7.1 | |||||
| Nitrogen Dioxide (NO2) ug/m3 | --- | 57.6-61.7 | 52.0-66.6 | 46.8-63.2 | 30.8-33.9 | |||||
| Total Suspended Particulates (TSP) ug/m3 | --- | 37-49 | 30-54 | 40-63 | 38-51 | |||||
| Respirable Suspended Particulates (RSP) ug/m3 | 100 | 17-27 | 21-33 | 29-43 | 12-18 | |||||
| Nitrogen Oxides (NOx) ug/m3 | --- | 88.6-92.5 | 71.9-94.9 | 65.7-87.3 | 38.6-51.9 | |||||
| Non-methane Hydrocarbons (NMHC) mg/m3 | --- | 1.33-1.87 | 1.25-1.70 | 1.44-1.98 | 0.92-1.22 | |||||
| PCBs (total) ng/m3 | --- | ND | ND | ND | ND | |||||
| Dioxins (total) pg/m3 | --- | 0.156 | 0.029 | 0.031 | 0.030 | |||||
| VOCs (total) ug/m3 | --- | ND | 254.8 | 101.18 | 27.34 | |||||
| Prevailing Wind Direction | --- | SW | SE | NW | SE | |||||
Remarks :
-Meteorological data were obtained on the roof of Technical building at CWTC.
-The Total 2,3,7,8-TCDD Toxicity Equivalence is the product sum of the concentration of all seventeen 2,3,7,8-substituted PCDDs/PCDFs congeners and their respective Toxicity Equivalence Factor (TEF). For those congeners with concentration found below the MDL, half MDL is used for calculation.
-ND stands for "Not Detected".
