Throughout this site, I present measurements of pollution. This page has information on where and how these measurements are being made.
The Site
| Category | Item | Value |
|---|---|---|
| Location | Latitude | 28.410825 |
| Longitude | 77.045039 | |
| City | Gurgaon | |
| Country | India | |
| Room 1 | Room volume | 65 m3 |
| Is the room air tight? | No | |
| Adult Occupants | 2 to 3 | |
| Child Occupants | 0 to 2 | |
| Room 2 | Room volume | 32 m3 |
| Is the room air tight? | Almost | |
| Adult Occupants | None | |
| Child Occupants | None | |
The Measuring Device
All measurements have been made using a PM sensors that I bought online.
| Make | nova PM sensors |
| Type | SDS0111 |
| Measuring units | μg/m3 |
| Resolution | 0.3 microns |
This device does not really have the 2.5 micron resolution required for accurate PM2.5 measurement. Therefore, the PM2.5 numbers reported by this device will be a little higher than actual.
The Setup
The sensor is connected to a laptop using the USB to UART convertor provided by the vendor in the device package. Power to the device is supplied through the 5V rails of the USB connector. The device emits a report every second at 96008N1 over UART. This is captured in a custom C program running on the laptop, and recorded in a CSV file. The CSV file is processed in LibreOffice and ends up in this Google Sheets.
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