This article aims to improve the estimation of the measured PM10 pollutants. In Sofia, there are several air pollution measurement stations. They measure PM10 particles, which are particles found in the air with a diameter between 2.5 and 10 micrometers.
The measurement stations fall into two categories, official stations and citizen stations. The official stations provide reliable measurements, they are better monitored and documented. The down-side is that they are only 5 and they are all concentrated in a single region. The citizen stations represent devices mounted on people homes or properties which measure PM10 particles. There is a whole network of such devices. They are many in number and provide a good coverage of the city. The problem with those measurements is that they are biased because of many local factors. Therefore the measurements form the citizen stations are not as reliable as those from the official stations, but on the up-side they are many in numbers.
In this article we define a method to reduce the bias of the measurements from the citizen stations.
Script in R below: library(stringr) #Step 1 ———————- rm(list=ls()) dd <- read.csv(“C:\\Users\\estoyanova\\OneDrive – VMware, Inc\\ES\\UNI\\master BA\\Boriana-Monthly challenge\\Air Tube\\data_bg_2017.csv”, header = TRUE, sep = “,”, na.strings = c(“”,” “, “NA”, “#NA”), stringsAsFactors = FALSE) topo <- read.csv(“C:\\Users\\estoyanova\\OneDrive – VMware, Inc\\ES\\UNI\\master BA\\Boriana-Monthly challenge\\TOPO-DATA\\sofia_topo.csv”, header = TRUE, sep = “,”, na.strings = c(“”,” “, “NA”, “#NA”), stringsAsFactors […]
I have just begun my machine learning course from Andrew Ng at Coursera so I thought that this challenge would be a good test of my learnings. I apologise for the delay for article writing as I was not sure if I should have taken this challenge or not since the dataset seemed difficult to […]
Data Exploration, Observations and Data Preparation Planning
1. Business Understanding The air quality in Sofia, Bulgaria, has been a problem for some time already. The population of the city is constantly increasing and this brings more traffic on the streets. The car ownership in Sofia is among the highest in Europe with around 600 cars per 1000 citizens. Another huge issue in […]
Preliminary Analisys Due to the objective focused on predicting air quality forecast for the next 24 hours per station, first step should be data understanding for citizen science air quality measurements to group it by station and summarize them by day. To complete this task for inspection and pre-processing in order to find missing data, outliers and […]
The day 20/10/2010 was the first to be officially announced by the UN and UNESCO as the world day of statistics. It was then decided that the role of statistics will be celebrated worldwide quinquennially. For the forthcoming 20/10/2015 the department of probability and statistics at the Institute of Mathematics and Informatics (IMI) at the […]