TheAirYouBreathe.com | Hong Kong Air Pollution compared to Western Standards.
WARNING SUMMARY Tung Chung No response action is required. API: 7 2019-09-23 17:00:00   Tung Chung Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. 2 2019-09-23 17:00:00 US Additional Advice Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion. Tung Chung Mild effects, unlikely to require action, may be noticed amongst sensitive individuals. 5 2019-09-23 17:00:00 Tung Chung Enjoy activities Good air quality | 56.5 2019-09-23 17:00:00

COUNTRY-BY-COUNTRY POLLUTION SUB-INDEX
PM10	Good / 20.1	Low / 2	Good air quality / 56.5	Bon / 3	57% of maximum
PM2.5 (est)*	Moderate / 55.4	Not indexed	Not indexed / 56.5	Not indexed / 3
Ozone	Moderate / 69.8	Moderate Pollution / 5	Good air quality / 53.1	No Data / 0	129% of maximum
NO2	Good / 10.4	Low / 1	Very good air quality / 9.1	Tres Bon / 1	11% of maximum
SO2	/	/	/ 0	/	0% of maximum
CO2	No Data / 0.4	No Data / 0	Very good air quality / 4.3	Not indexed	Not indexed
GENERAL AIR QUALITY INDEXES
	USA Good Moderate Unhealthy for Sensitive Groups Unhealthy Very unhealthy Hazardous	United Kingdom 1. Low 2. Low 3. Low 4. Moderate Pollution 5. Moderate Pollution 6. Moderate Pollution 7. High Pollution 8. High Pollution 9. High Pollution 10. Very High Pollution	Australia Very good air quality Good air quality Fair air quality Poor air quality Very poor air quality Hazardous	France 1. Tres Bon 2. Bon 3. Bon 4. Bon 5. Moyen 6. Mediocre 7. Mediocre 8. Mauvais 9. Mauvais 10. Tres Mauvais	Hong Kong Low Medium High Very High Severe

CURRENT POLLUTANT CONCENTRATIONS
in Tung Chung

PM10/RSP
The 24 hour average for RSP/PM10 is 28 ug/m3
The average for RSP/PM10 since midnight is 20 ug/m3
The 1 hour average for RSP/PM10 is 0

PM2.5--ESTIMATED (the Hong Kong government refuses to release PM2.5 data, so we estimate based on previous ratios of PM10 : PM2.5. When the Hong Kong government starts to release the REAL data, we'll start using it)
The 24 hour average for RSP/PM2.5 is 20 ug/m3
The average for RSP/PM2.5 since midnight is 14 ug/m3

OZONE -- 8 HOUR
The 8 hour average for o3 is 128.9125000

OZONE -- 4 HOUR
The 8 hour average for o3 is 83.3375000

OZONE -- 1 HOUR
The 1 hour average for o3 is 0 ug/m3

SO2--1 HOUR AVERAGE
The 1 hour average for so2 is 0 ug/m3
The 24 hour average for so2 is 0 ug/m3

CO--8 HOUR AVERAGE is 450 ug/m3

* The highest warning level for any one pollutant determines the overall warning level for a country, so if PM10 is ranked very high and CO2 is ranked very low, the overall warning is HIGH due to PM10's ranking.
* Different countries rate different pollutants as a different threat. For example the USA listings on PM10 pollution allow for a considerably higher amount than the Australia or World Health Organization.
* The W.H.O. standards are very strict and Hong Kong is basically in violation the majority of the time.
* Some of the measurements are based on 24 hour standards and are designed more for tracking historical trends than alerting the public to present or future problems. For example PM10 will increase during the day to levels, if they were maintained 24 hours straight, would be quite high, but as that measurement utilizes a 24 hour average the pollution indexes are adjusted accordingly.