Avsamoht

Hi Everyone What speaks against using an [existing Air Quality Index](https://en.wikipedia.org/wiki/Air_quality_index) like the [CAQI ](http://www.airqualitynow.eu/about_indices_definition.php)?

the >180 value indicates "this is very bad and shouldn't happen" no reason to say this is very very bad and shouldn't happen

if you change the scala: 180-200 200-500 500-1999 the statement is: 190 isn't that bad it could be worse

The CAQI scale is less strict than the one ricki-z suggested earlier: > Green 0-40 > Yellow 41-60 > Orange 61-80 > Red 81-1999 @ubahnverleih the scale you posted is...

the real questions are: what is the purpose of the scale? who is the audience / has the audience a profound knowledge of air quality? should it just be visualisation...