Kolkata Pollution Dataset
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Our data is spatiotemporally rich and is one of the only publicly available datasets for calibrated PM values based in a developing country. The difference between the PM value distributions of a developing and a developed country is staggering. To corroborate our point and the need for a dataset like ours, we provide a detailed analysis comparing a mobile air monitoring dataset[2] which belongs to the city Hamilton in Ontario, Canada collected during 114 days of air pollution monitoring between November 2005 to November 2016 with our dataset based on a number of parameters. For the purpose of comparison, we divide Delhi and Hamilton into regions by rounding off the latitude and longitude of each record to 3 decimal places and the grouping all the record belonging to each region.

Comparison of Kolkata, Delhi and Canada datasets over different parameters and statistical aspects

The following tables show comparison of Kolkata dataset with Delhi dataset and Canada dataset over different parameters. It also presents statistical comparison of PM values recorded by both datasets.

The below table provides comparison of Kolkata, Delhi, Canada dataset and Zurich dataset over different metrices
Metric Kolkata Dataset Delhi Dataset Canada Dataset Zurich dataset
Total number of samples 104447 12542183 46080 Varying for different pollutants (19.9 - 49.7 Million)
Sample with atleast one PM (1.0, 2.5, 10.0) value 104447 12542183 13048 -
Pollutants covered PM2.5 PM1, PM2.5, PM10 CO, NO, NO2, SO2, O3, PM1, PM2.5, PM10 O3, CO, NO2 and UFP
Vehicles used Static@Colleges / Mobile@Public bus Public bus Commercial van Trams
Monitoring Period 142 days 91 days 114 days Varying for different pollutants (2.5 - 4.5 years)
Calibration Yes No No -
The table below presents estimate of cost of the other sensors(COx, NOx, SOx). We are currently trying augment some of our instruments with additional sensors, but this needs careful planning as budgets in developing countries is scarce. We have started our measurements with PM as accurate PM sensors are available at 2,500 INR.
Pollutants vendor1 (honeywell) vendor2 (alphasense) vendor3 (winsen)
SO2 17,337 INR 8,500 INR 10,600 INR
NO 14,600 INR 8,500 INR -
NO2 10,618 INR 8,500 INR 10,530 INR
CO - 8,500 INR 4,450 INR
CO2 - - 2,910 INR
O3 - - 4,288.28 INR
The below table provides statistical comparison of PM2.5 values of Kolkata, Delhi and Canada dataset[2].
Metric Kolkata Delhi Canada
Mean 75.82 207.92 15.08
Std 35.49 114.36 12.87
Missing % 0 0 73.62

References

  1. Jason Jingshi Li, Boi Faltings, Olga Saukh, David Hasenfratz, and Jan Beutel. Sensing the airwe breathe: The opensense zurich dataset. In proceedings of the Twenty-Sixth AAAI Conferenceon Artificial Intelligence , AAAI’12, page 323–325. AAAI Press, 2012.

  2. Matthew D. Adams and Denis Corr. A mobile air pollution monitoring data set.Data, 4(1),2019