The Singapore Hazometer is a simple npm module allowing for easy retrieval of pollutant data from data.gov.sg, which is in turn sourced from NEA.
`node demo.js`
const hazometer = require("sg-hazometer")
const apiKey = "xxx" // get one here https://developers.data.gov.sg
hazometer.getInfo({apiKey}, function(err, data){
console.log(data)
})
You'll get something like the following:
{
summary: 'healthy',
last_update: 2017 - 02 - 09 T14: 00: 00.000 Z,
east: {
dailyPM10: 32,
dailyPM25: 20,
'8hCO': 0.27,
'2hNO2': 15,
dailySO2: 3,
'8hO3': 56,
'3hPSI': 53,
dailyPSI: 60,
location: {
latitude: 1.35735,
longitude: 103.94
}
},
central: {
dailyPM10: 29,
dailyPM25: 19,
'8hCO': 0.58,
'2hNO2': 60,
dailySO2: 5,
'8hO3': 58,
'3hPSI': 59,
dailyPSI: 59,
location: {
latitude: 1.35735,
longitude: 103.82
}
},
south: {
dailyPM10: 28,
dailyPM25: 18,
'8hCO': 0.52,
'2hNO2': 60,
dailySO2: 137,
'8hO3': 57,
'3hPSI': 59,
dailyPSI: 61,
location: {
latitude: 1.29587,
longitude: 103.82
}
},
north: {
dailyPM10: 33,
dailyPM25: 21,
'8hCO': 0.4,
'2hNO2': 20,
dailySO2: 11,
'8hO3': 63,
'3hPSI': 56,
dailyPSI: 61,
location: {
latitude: 1.41803,
longitude: 103.82
}
},
west: {
dailyPM10: 30,
dailyPM25: 17,
'8hCO': 0.78,
'2hNO2': 39,
dailySO2: 4,
'8hO3': 77,
'3hPSI': 40,
dailyPSI: 56,
location: {
latitude: 1.35735,
longitude: 103.7
}
},
national: {
dailyPM10: 33,
dailyPM25: 21,
'8hCO': 0.78,
'2hNO2': 60,
dailySO2: 137,
'8hO3': 77,
'3hPSI': 55,
dailyPSI: 61,
location: {
latitude: 0,
longitude: 0
}
}
}
summary: human-readable assessment of current air quality (see this)
dailyPM10: 24h readings for particulate matter 10 micrometers or less in diameter
dailyPM25: ditto, but for particulate matter 2.5 micrometers or less in diameter
8hCO: 8h readings for Carbon Monoxide levels
2hNO2: 2h readings for Nitrogen Dioxide levels
dailySO2: 24h readings for Sulfur Dioxide levels
8hO3: 8h readings for Ozone levels
3hPSI: 3h readings for the NEA-released Particulate Matter Index (PSI)
dailyPSI: ditto but every 24h
location: coordinates of the points at which the readings are taken at
The data.gov.sg API seems to be faulty.
The Pollutant Standards Index (PSI) is calculated from sub-indexes using a formula detailed here. This module retrieves the raw data that is used to calculate the index, that is then used to calculate the overall PSI. Unless you plan to check NEA's mathematics, it's unlikely the sub-index itself will be of any interest.
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