Shanghai PM2.5 main AQI update: Comparative PM2.5 data for 3 measurement stations in Shanghai

Posted on January 19th 2013
Share: aqicn.org/faq/2013-01-19/shanghai-pm25-main-aqi-update-comparative-pm25-data-for-3-measurement-stations-in-shanghai

Shanghai AQI data is now based on the maximum PM2.5 AQI data for 3 stations: Shanghai US Consulate (上海美国总领事馆), Jingan (静安监测站)
and Shanghai Normal College Primary Division (上海师范专科学校附属小学).

The first station is maintained by US Consulate in Shanghai, while the two last ones are provided by Shanghai Environment Monitoring Center(上海市环境监测中心), which is governmental center.

If you have concerns about some stations reporting lower PM2.5 data compared to others, then refer to the following graphics; they show the relative PM2.5 reporting for the last 5 days for each of the above mentioned stations:

Shanghai AQI data is now based on the maximum PM2.5 AQI data for 3 stations: Shanghai US Consulate (上海美国总领事馆), Jingan (静安监测站)
and Shanghai Normal College Primary Division (上海师范专科学校附属小学).

The first station is maintained by US Consulate in Shanghai, while the two last ones are provided by Shanghai Environment Monitoring Center(上海市环境监测中心), which is governmental center.

If you have concerns about some stations reporting lower PM2.5 data compared to others, then refer to the following graphics; they show the relative PM2.5 reporting for the last 5 days for each of the above mentioned stations:

Shanghai US Consulate (上海美国总领事馆) PM2.5 AQI reported by Shanghai US consulateShanghai US Consulate, Schanghai PM25 (PM2,5 ( kleiner Feinstaub))  measured by U.S. Consulate Shanghai Air Quality Monitor.
Values are converted to the US EPA AQI standard.
Shanghai Normal College Primary Division (上海师范专科学校附属小学) PM2.5 AQI reported by Shanghai MEPShanghai Normal College Primary Division, Schanghai PM25 (PM2,5 ( kleiner Feinstaub))  measured by Shanghai Environment Monitoring Center(上海市环境监测中心).
Values are converted to the US EPA AQI standard.
Jingan (静安监测站) PM2.5 AQI reported by Shanghai MEPJingan, Schanghai PM25 (PM2,5 ( kleiner Feinstaub))  measured by Shanghai Environment Monitoring Center(上海市环境监测中心).
Values are converted to the US EPA AQI standard.

As you can see, the reality is that Shanghai Environmental Protection Center and Shanghai US Consulate PM2.5 data is similar. And actually, in many case, the raw µg/m3 PM2.5 data reported by China MEP (China Ministry of Environmental Protection, to which Shanghai EP Center is reporting data) is actually higher than what is reported by the US consulate.

Some of the readers might be surprised since other apps (like the famous Dirty Beijing) are known to "highlight" lower AQI measured by MEP compared to the US data. The reason is that they do not use the same PM2.5 µg/m3 to AQI convertion for MEP and US data, meaning that they are comparing apple and bananas.

In this web site, all pollutant data (PM2.5, PM10, NO2, SO2, CO, O3) are converted from µg/m3 to AQI using the same convertion formula, which is the official EPA (US Environment Protection Agency) (revision from 2011, which is much more stict than the 2006 one; sorry no we cannot find the link to this revision). Only usign this unique convertion formula, it makes sense to compare the AQI data.

So, now, you might ask what is the trick with the MEP data? Well, it is just that the US EPA convertion formula is much more strict than others (and even more for the 2011 one), especially for AQI values below 150. So, if you look at the raw PM2.5 µg/m3 data, values are very much similar between US and MEP. But if you look at the AQI converted values , then, yes, China MEP based convertion formula AQI values are lower than the US EPA based convertion formula AQI values. But no worry, this site only uses the US EPA convertion formula, so regarless of which center is reporting the PM2.5 µg/m3 data, you will always get the safe AQI measurement based on the US Environment Protection Agency.

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    Über Messungen zur Luftqualität und Verschmutzung

    Über die Luftqualitätsstufen

    -Werte zur Luftqualität (AQI)Stufen zur Bewertung der Gesundheitsgefährdung
    0 - 50GutDie Qualität der Luft gilt als zufriedenstellend und die Luftverschmutzung stellt ein geringes oder kein Risiko dar
    51 -100ModeratDie Luftqualität ist insgesamt akzeptabel. Bei manchen Schadstoffe besteht jedoch eventuell eine geringe Gesundheitsgefahr für einen sehr kleinen Personenkreis, der sehr empfindlich auf Luftverschmutzung ist.
    101-150Ungesund für empfindliche PersonengruppenBei Mitgliedern von empfindlichen Personengruppen können gesundheitliche Auswirkungen auftreten. Die allgemeine Öffentlichkeit ist wahrscheinlich nicht betroffen.
    151-200UngesundErste gesundheitliche Auswirkungen können sich bei allen Personen einstellen. Bei empfindlichen Personengruppen können ernstere gesundheitliche Auswirkungen auftreten.
    201-300Sehr ungesundGesundheitswarnung aufgrund einer Notfallsituation. Die gesamte Bevölkerung ist voraussichtlich betroffen.
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    Um mehr zur Luftqualität und -verschmutzung zu erfahren, gehen Sie auf die Seite wikipedia Luftqualität Thema oder den AIRNow Leitfaden für Luftqualität und Ihre Gesundheit .

    Sehr nützliche Gesundheitsratschläge gibt der Pekinger Arzt Richard Saint Cyr MD, www.myhealthbeijing.com Blog.


    Usage Notice: All the Air Quality data are unvalidated at the time of publication, and due to quality assurance these data may be amended, without notice, at any time. The World Air Quality Index project has exercised all reasonable skill and care in compiling the contents of this information and under no circumstances will the World Air Quality Index project team or its agents be liable in contract, tort or otherwise for any loss, injury or damage arising directly or indirectly from the supply of this data.



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