# Air Quality Binding

This binding uses the AQIcn.org service (opens new window) for providing air quality information for any location worldwide.

The World Air Quality Index project is a social enterprise project started in 2007. Its mission is to promote Air Pollution awareness and provide a unified Air Quality information for the whole world.

The project is proving a transparent Air Quality information for more than 70 countries, covering more than 9000 stations in 600 major cities, via those two websites: aqicn.org (opens new window) and waqi.info (opens new window).

To use this binding, you first need to register and get your API token (opens new window).

# Supported Things

Bridge: The binding supports a bridge to connect to the AQIcn.org service (opens new window). A bridge uses the thing ID "api".

Station: Represents the air quality information for an observation location.

Of course, you can add multiple Stations, e.g. for measuring AQI for different locations.

# Discovery

Local Air Quality can be autodiscovered based on system location. You will created a Bridge with your apiKey.

# Bridge Configuration

The bridge configuration only holds the api key :

Parameter Description
apiKey Data-platform token to access the AQIcn.org (opens new window) service. Mandatory.

# Thing Configuration

The 'Station' thing has a few configuration parameters:

Parameter Description
location Geo coordinates to be considered by the service.
stationId Unique ID of the measuring station.
refresh Refresh interval in minutes. Optional, the default value is 60 minutes.

For the location parameter, the following syntax is allowed (comma separated latitude and longitude):

37.8,-122.4
37.8255,-122.456

If you always want to receive data from specific station and you know its unique ID, you can enter it instead of the coordinates.

This stationId can be found by using the following link: https://api.waqi.info/search/?token=TOKEN&keyword=NAME (opens new window), replacing TOKEN by your apiKey and NAME by the station you are looking for.

# Thing properties

Once created, at first execution, the station's properties will be filled with informations gathered from the web service :

  • Nearest measuring station location
  • Measuring station ID
  • Latitude/longitude of measuring station

# Channels

The AirQuality information that is retrieved for a given is available as these channels:

# AQI Channels Group - Global Results

Channel ID Item Type Description
alert-level Number Alert level (*) associated to AQI Index.
index Number Air Quality Index
timestamp DateTime Observation date and time
dominent String Dominent Pollutant
icon Image Pictogram associated to alert-level
color Color Color associated to alert level.

# Weather Channels Group

Channel ID Item Type Description
temperature Number:Temperature Temperature in Celsius degrees
pressure Number:Pressure Pressure level
humidity Number:Dimensionless Humidity level
dew-point Number:Temperature Dew point temperature
wind-speed Number:Speed Wind speed

# Pollutants Channels Group

For each pollutant (PM25, PM10, O3, NO2, CO, SO2) , depending upon availability of the station, you will be provided with the following informations

Channel ID Item Type Description
value Number:Density Measured density of the pollutant
index Number AQI Index of the single pollutant
alert-level Number Alert level associate to the index

(*) The alert level is described by a color :

Code Color Description
0 Green Good
1 Yellow Moderate
2 Orange Unhealthy for Sensitive Groups
3 Red Unhealthy
4 Purple Very Unhealthy
5 Maroon Hazardous

# Full Example

airquality.things:

Bridge airquality:api:main "Bridge" [apiKey="xxxyyyzzz"] {
    station home "Krakow"[location="50.06465,19.94498", refresh=60]
}

airquality.items:

Group AirQuality <flow>

Number   Aqi_Level           "Air Quality Index" <flow> (AirQuality) { channel="airquality:station:main:home:aqi#index" }
Number   Aqi_Pm25            "PM\u2082\u2085 Level" <line> (AirQuality) { channel="airquality:station:main:home:pm25#value" }
Number   Aqi_Pm10            "PM\u2081\u2080 Level" <line> (AirQuality) { channel="airquality:station:main:home:pm10#value" }
Number   Aqi_O3              "O\u2083 Level" <line> (AirQuality) { channel="airquality:station:main:home:o3#value" }
Number   Aqi_No2             "NO\u2082 Level" <line> (AirQuality) { channel="airquality:station:main:home:no2#value" }
Number   Aqi_Co              "CO Level" <line> (AirQuality) { channel="airquality:station:main:home:co#value" }
Number   Aqi_So2             "SO\u2082 Level" <line> (AirQuality) { channel="airquality:station:main:home:so2#value" }

DateTime Aqi_ObservationTime "Time of observation [%1$tH:%1$tM]" <clock> (AirQuality) { channel="airquality:station:main:home:aqi#timestamp" }

Number:Temperature  Aqi_Temperature     "Temperature" <temperature> (AirQuality) { channel="airquality:station:main:home:weather#temperature" }
Number:Pressure     Aqi_Pressure        "Pressure" <pressure> (AirQuality) { channel="airquality:station:main:home:weather#pressure" }
Number:Dimensionless Aqi_Humidity        "Humidity" <humidity> (AirQuality) { channel="airquality:station:main:home:weather#humidity" }

airquality.sitemap:

sitemap airquality label="Air Quality" {
    Frame {
        Text item=Aqi_Level valuecolor=[
                Aqi_Level=="-"="lightgray",
                Aqi_Level>=300="#7e0023",
                >=201="#660099",
                >=151="#cc0033",
                >=101="#ff9933",
                >=51="#ffde33",
                >=0="#009966"
            ]
        Text item=Aqi_Description valuecolor=[
                Aqi_Description=="HAZARDOUS"="#7e0023",
                =="VERY_UNHEALTHY"="#660099",
                =="UNHEALTHY"="#cc0033",
                =="UNHEALTHY_FSG"="#ff9933",
                =="MODERATE"="#ffde33",
                =="GOOD"="#009966"
            ]
    }

    Frame {
        Text item=Aqi_Pm25
        Text item=Aqi_Pm10
        Text item=Aqi_O3
        Text item=Aqi_No2
        Text item=Aqi_Co
        Text item=Aqi_So2
    }

    Frame {
        Text item=Aqi_ObservationTime
        Text item=Aqi_Temperature
        Text item=Aqi_Pressure
        Text item=Aqi_Humidity
    }

}

airquality.rules:

rule "Change lamp color to reflect Air Quality"
when
    Item Aqi_Description changed
then
    var String hsb

    switch Aqi_Description.state {
        case "HAZARDOUS":
            hsb = "343,100,49"
        case "VERY_UNHEALTHY":
            hsb = "280,100,60"
        case "UNHEALTHY":
            hsb = "345,100,80"
        case "UNHEALTHY_FSG":
            hsb = "30,80,100"
        case "MODERATE":
            hsb = "50,80,100"
        case "GOOD":
            hsb = "160,100,60"
    }

    Lamp_Color.sendCommand(hsb)
end