Air Quality Gas Sensor analysis
Sensing Ozone, NO2, SO2 and CO

Share: aqicn.org/sensor/gas/hk/
This page contains list of Gas sensors "suitable" for ambient and outdoor Air Quality sensing, and currently under tesing by the World Air Quality Index project Earth Sensing labs. (For a complete list of all the Air Quality Sensors test on the World Air Quality Index project, check our sensor overview page)

The most common Gas Air pollutants are Ozone (O3), Nitrogen Dioxide (NO2), Sulphur Dioxide (SO2), and Carbon Monoxyde (CO), but it is also common to measure Hydrogen Sulphide (H2S), Methane (CH4), Benzene (C6H6)...


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Ozone

Ground ozone is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of sunlight. Breathing ozone can trigger a variety of health problems, especially for those with lung diseases such as asthma. Ground level ozone can also have harmful effects on sensitive vegetation and ecosystems.

Ambient Ozone sensing is done in the range 0 ~ 500ppb (for reference 54ppb corresponds to an AQI of 50 - at 8 hours exposure, and 500 ppb corresponds to an AQI of 500 at 1 hour exposure, using the US EPA standard).

The most common and official way to measure ground level Ozone is by UV absorption photometry (WMO ref), The "low-cost" Ozone sensors, on the contrary, are based on electro-chemical analysis, and are therefore much less accurate than photometers.

  • Winsen MQ 131
  • Manufacturer: Zhengzhou Winsen Electronics Technology Co., Ltd.
    Cost: 60RMB.
    Spec: Spec sheet, product page
    Detection range: 10 ppb ~ 1ppm (for the low concentration version)
    Detection accuracy: unknown.
    The MQ 131 is a electro-chemcial Ozone sensor able to detect on the range from 10 ppb to 1 ppm.
  • A3OZ EnviroceL®
  • Manufacturer: City Tech
    Cost: ? (>1000RMB)
    Spec: Spec sheet, product page
    Detection range: 0-10ppm
    Detection accuracy: 20ppb.
    The A3OZ sensor is one of a range for monitoring gases at levels found in the environment. It is designed to give accurate readings of O3 or NO2 in ambient air.
  • Sensortech Mics 2614
  • Manufacturer: sgxsensortech.com
    Cost: 120RMB.
    Spec: Spec sheet, product page
    Detection range: 10 ppb ~ 1ppm
    Detection accuracy: unknown.
    The Mics 2614 is a SMD O3 sensor able to detect on the range from 10 ppb to 1 ppm.
    It is unfortunately discontinued since early 2016 due to supply problems with the special wafers used in manufacturing.
  • Spec 3SP-O3-20
  • Manufacturer: spec-sensors.com
    Cost: 60RMB.
    Spec: Spec sheet, product page
    Detection range: 20 ~ 20 ppm
    Detection accuracy: unknown.
    The Spec Sensors 3SP-O3-20 is detecting O3 in the range 0 - 20 ppm, with uknwown accuracy... - which makes it not suitable to ambient Ozone sensing.

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Nitrogen Dioxide

NO2 primarily gets in the air from the burning of fuel. It forms from emissions from cars, trucks and buses, power plants, and off-road equipment - so it is most relevant for road-side sensing.

Ambient NO2 sensing is done in the range 0 ~ 2000ppb (for reference 54ppb corresponds to an AQI of 50, and 2000 ppb corresponds to an AQI of 500, using the US EPA standard).

The are at least 3 common and official methods for measuring NO2: (Derfra ref) The first two are based on infra-red absorbtion resp. em-radition, and the 3rd one, but also most recent, is based on the Chemiluminescence principle. The "low-cost" Ozone sensors, on the contrary, are based on electro-chemical analysis, and are therefore much less accurate than any of the 3 above methods.

  • Sensortech Mics 2714
  • Manufacturer: sgxsensortech.com
    Cost: 150RMB.
    Spec: Spec sheet, product page
    Detection range: 50 ppb ~ 5ppm
    Detection accuracy: unknown.
    The Mics 2714 is a SMD Nitrogen dioxide sensor able to detect on the range from 50 ppb to 5 ppm. Note there there is another variant, the Miscs 4514, able to detect higher NO2 ranges, but the 2714 is the most suitable for Ambient NO2 sensing.
    Unfortunatelt, the Mics 2714 is not able to detect NO2 below 50ppb (ie an AQI of 50), so that is not so usefull for places with low NO2 concentration (which is quite often the case).
  • Alpha Sense NO2 B43F
  • Manufacturer: alphasense.com
    Cost: 1000RMB.
    Spec: Spec sheet, product page
    Detection range: 0 ppb ~ 2ppb
    Detection accuracy: unkown.
    The Alpha Sense NO2 B43F is a special low-concentration version of the NO2 familly range, detecting NO2 in the range 0 - 2 ppm, which makes it suitable for ambient sensing.
  • Sensortech SGX EC4 20 NO2
  • Manufacturer: sgxsensortech.com
    Cost:
    Spec: Spec sheet, product page
    Detection range: 0 ppb ~ 2ppm
    Detection accuracy: unkown.
    The Sensortech ZE03 is detecting NO2 in the range 0 - 20 ppm, with uknwown accuracy... - which makes it not suitable to ambient NO2 sensing.
  • Winsen ZE03
  • Manufacturer: winsen-sensor.com
    Cost:
    Spec: Spec sheet, product page
    Detection range: 0 ppb ~ 2ppm
    Detection accuracy: unkown.
    The Winsen ZE03 is detecting NO2 in the range 0 - 20 ppm, with uknwown accuracy... - which makes it not suitable to ambient NO2 sensing.
  • Honeywell 4NO2-20
  • Manufacturer: honeywell.com
    Cost: 450RMB.
    Spec: Spec sheet, product page
    Detection range: 0 ppb ~ 2ppm
    Detection accuracy: 100ppb.
    The Honeywell is fomerly knonw as Solidsense 4NO2-20. The 4NO2-20 (like the 7NO2-20) is able to detect NO2 in the range 0 to 20 ppm, with a resoliution of 100ppb - which makes it not suitable to ambient NO2 sensing.
  • DD Scientific GS+4NO2
  • Manufacturer: ddscientific.com
    Cost: 460RMB.
    Spec sheet, product page
    Detection range: 0 ppb ~ 30ppm
    Detection accuracy: 200ppb.
    The DD GS+4NO2 is detecting NO2 in the range 0 - 30 ppm, with accuracy of ±200 ppb - this is too sensitive for ambient NO2 sensing.

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Sulphur Dioxyde

to be updated...

Carbon Monoxyde

to be updated...


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For the list of all air quality sensors, check the Sensor Overview page

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關於空氣質量與空氣污染指數

本網站採用的污染指數和顏色與EPA是完全相同的。 EPA的指數可以從 AirNow上查到

空气质量指数 空气质量指数级别(状况)及表示颜色 对健康影响情况 建议采取的措施
0 - 50 一级(优) 空气质量令人满意,基本无空气污染 各类人群可正常活动
51 -100 二级(良) 空气质量可接受,但某些污染物可能对极少数异常敏感人群健康有较弱影响 极少数异常敏感人群应减少户外活动
101-150 三级(轻度污染) 易感人群症状有轻度加剧,健康人群出现刺激症状 儿童、老年人及心脏病、呼吸系统疾病患者应减少长时间、高强度的户外锻炼
151-200 四级(中度污染) 进一步加剧易感人群症状,可能对健康人群心脏、呼吸系统有影响 儿童、老年人及心脏病、呼吸系统疾病患者避免长时间、高强度的户外锻炼,一般人群适量减少户外运动
201-300 五级(重度污染) 心脏病和肺病患者症状显著加剧,运动耐受力降低,健康人群普遍出现症状 儿童、老年人及心脏病、肺病患者应停留在室内,停止户外运动,一般人群减少户外运动
300+ 六级(严重污染) 健康人群运动耐受力降低,有明显强烈症状,提前出现某些疾病 儿童、老年人和病人应停留在室内,避免体力消耗,一般人群避免户外活动
(参考详见 http://zh.wikipedia.org/wiki/空气质量指数)

如果你想了解更多有關空氣質量與污染,詳見維基百科或者 AirNow

有關健康建議詳​​見北京的Richard Saint Cyr MD醫生的博客:www.myhealthbeijing.com


注意事項: 所有空氣品質數據在發佈時均未經驗證,且為了確保資料準確性,這些數據可能隨時被修改,恕不另行通知。 世界空氣品質指數專案在編制這些訊息內容時已經謹慎的運用了所有適當的技巧,在任何情況下世界空氣品質指數 在任何情況下,世界空氣品質指數專案團隊或其代理人均不對因提供此數據而直接或間接引起的任何損失、傷害或損害來承擔契約、侵權或其他責任。



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