I have had this problem from the start, and that is because PWS uses the EPA calculations, rather than UK ones. If I change it to EPA on the WeatherLink dashboard, then it works as normal on the PWS dashboard, but then my AirLink data looks wrong on my main website.
PWS-dashboard 2012-lts only understands the World-wide index and the European one.
Nothing to do about that.
Regards,
Wim
I still fail to see why my PWS canât show the UK index? Or any other index for that matter. Itâs a bit weird if weâre unable to use our native index for air quality.
Native index is all relative to your location. Wim lives in the Netherlands which is in Europe/The World so PWSD supports his native indexes. It would need code changes to make it display other indexes, so itâs not something you can do with dashboard out of the box. The source code is all provided so thereâs nothing stopping you creating your own version that fully supports the UK index.
Having said that, does the Davis AirLink device fully support the UK index? I understood that AirLink monitors particulate matter (PM1, PM2.5 and PM10). The UK (DAQI) index also includes NO2, SO2 and O3 so Iâm not sure how an air quality value from Airlink via Weatherlink could actually give a UK index compatible value?
If the PWS is available for anybody, it doesnât seem right to exclude other countries?!
In fact, the Dutch have their own index, which is different from the EPA.
Well, the index values that are coming from the API of AirLink are UK index values, you can see them on my home page and here: Wareham Weather - Air Quality
^ Those values are coming directly from AirLink itself.
^ WeatherLink
I donât think your air quality values are what you think they are, i.e. real UK Index values. Where is your Airlink unit getting the NO2/SO2/O3 readings from when it doesnât have built-in sensors to measure the concentrations of those gases? At best WeatherLink could combine your local PM data from the nearest âofficialâ unit with your local PM readings, but in many cases the nearest official unit is tens of miles away so isnât really a good measure of your local environment. So perhaps you should really be asking Davis whether theyâre really providing UK DAQI values.
I think you have incredibly high expectations of features that must be supported by low cost/free software. There is no obligation for any software author to try to support any and all standards/units from all parts of the world.
I just zoomed in on your Weatherlink AQI images and itâs worse than I thought. Theyâre only based on PM2.5 readings. That means they donât include 5 other values that are part of the UK Air Quality Index calculation. So displaying them as UK Index values would actually be misleading.
Huh?
Iâm not sure why youâre bringing NO2/SO2/O3 in to the equation, it has nothing to do with that. This is simply PM2.5 and PM10.
No conversions are needed, itâs raw data from AirLink.
Just to add; The EPA version of the script is only PM 2.5 and PM10.
If you look at the Defra website, it has an index for PM2.5 and PM10 on their own, separate from the other particulates.
I think you need to do some reading about the UK Air Quality Index (ComEAP - DAQI), e.g. Air pollution - Met Office
If you look at the table part way down it shows all 6 of the monitored pollutants that I quoted and not just PM2.5 and PM10.
I donât need to look at anything, this is about PM2.5 and PM10.
Youâve completely thrown this thread off-topic.
Just for the record, youâre reading that wrong. Look at the bandings⌠you can separate 2.5 and 10 in to their own index. Itâs on the Defra website.
The EEA index s the European one.
The World-wide index is the first one used and originates from the US
A number of European countries do not want to use the EEA index as their country would look too bad when comapring to other European countries.
F.I. Germany removed the PM2.5 from their AQI, but that is the most important one.
The AQI level values are different for each pollutant.
The complete AQI for a location should at least contain PM2.5 as that is the most dangerous one.
A local hobby station as most of us have do not measure other important pollutants and often do not measure 24 hour values which should be used to calculate a correct AQI
Now the request to add other local AQI calculations.
For that I need at least access to 2 stations-data, either directly uploaded or a documented API+key such as the one from WL.com
Also the correct documentation of the local AQI level values
Developing, making test-sets and testing the code will take a few days at least for each local AQI
Maintaining that code for only a few users is not a trivial task either.
You bought an expensive AQ sensor which stores its data on a paid-for sensor. Davis has to supply more than 1 AQI index as otherwise they would sell less devices and less yearly fees.
Now you are requesting the same level of support from a 1 persons-hobby.
It seems a good idea to start developing your own scripts, maybe even a dashboard?
If you ever donated for the PWS-dashboard, please reply my âthank youâ mail and I will refund your donation next week when I am home again.
Wim
PS the ship is âslowlyâ wobbling? and the internet is slow. I could not check âmyenglishâ, sorry for that.
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I think the argument about different particle sizes, NO2/SO2/O3 applies to many of the AQIâs not just the UK. As amateurs we only have a limited amount of the data for a full calculation, but you can still get an index for the data we have. Now that may indicate decent quality when there is bad SO2 pollution but few particulates when the official index reads bad, but so long as you aware of the limitation it is still a valid indicator, no?
(I dug through all the documentation for most of the popular indices - 19 variations - in order to implement them in Cumulus MX)
Thatâs true to an extent but when itâs going on a web site intended for public viewing then I think you need to be careful. You might understand the limitations but do all of your viewers?
What if NO2 is bad in your area but particulates arenât too bad. The local council wants to implement measures to reduce the NO2 pollution but face arguments from local people saying âthe local weather site says the air quality is great so why do you want to spend so much of our money?â
I still do not understand why other pollutants have been brought in to this? I havenât mentioned anything about themâŚ
Many countries, including the UK, have an index for PM 2.5 and 10, separate from other pollutants - which I am not interested in.
AirLink provides only PM1, 2.5 AND 10. It also provides an AQI for those particulates, and all I was asking was, itâd be nice to have it set to the UK variant on the PWS dashboard.
Iâm lost for words as to how this thread has turned in to a complete mess.
You can fetch AirLink data straight from the device, no need to get involved with Davisâ servers.
What part of âI donât care about N02â do you not get? Tell me where I even asked about it?
You have the answer to the question you asked.
Topic closed.
PWSdashboard can not fetch anything from a local device as it runs on a remote server. It gets your AQ data from WL.com
Weatherdisplay, Weewx, Meteobridge and other weatherprograms can access your data locally.