ISSS608 2018-19 T1 Assign Arief Sulistio Task1
ISSS608 Visual Analytics and Applications - Assignment 3
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Task 1: Spatio-temporal Analysis of Official Air Quality
In this page, we will discuss more on the Spatio-temporal analysis of Official Air Quality measurement to see current situation in Sophia City
Data Exploratory
Figure 1 (Top) show the data available from the data source provided. There are total 6 station, 1 station: "Orlov Most", was deactivate by end of 2015, and another station "Mladost" just started in 2018. There are some missing data from 2013-2017 and some replication (Dark blue color) which should not have significant impact to our analysis. All station was shut down on 2017, and re-start back on 2018 with improvement in capability of measuring hourly data instead of previous daily data.
Location wise, all station was located in the city center with inter-station distance of up to 11km. This show a poor coverage of measurement data since all was clustered together.
Figure 2 (Top) show the concentration of air pollution from 2013 to 2018, all station's data show a strong correlation between each other as expected since all stations was located near to each other. From this data we can observed a yearly pattern where the air pollution will reach its peak every end of the year (Dec/Jan period). From past 5 years data, the highest air pollution recorded was on Dec'13-Jan'14 where it reach 400µg/m3.
Starting 2018, all stations was capable to record hourly data instead of yearly data, and it seems that the data from station "Druzhba" was shifted as it continuously perform below other stations (about ~10µg/m3 lower).
Data Analysis
Figure 3 (Top) show a daily air pollution reading for the past 5 years. On the left, we observed that from the past 5 years the are 80% chance that the air pollution was below EU limit of 50µg/m3. Since we already know that the air pollution pattern have yearly cycle, we breakdown the reading into monthly and compare year-on-year performance of monthly air pollution reading and % of having air pollution reading below EU standard (Top right chart). When we further drill down the distribution, we can see that during March to October every year, the air pollution was relatively lower at average of 20-40µg/m3 with most of the day the pollution perform below EU limit. On the other hand, during Nov-Feb every year the air pollution increased more than double with more than half of the time the air pollution is higher than EU standard.
