Data for indoor air quality monitoring using Sensirion SEN66

Data collected from the Sensirion SEN66 device for indoor air quality monitoring This repository contains data collected from the Sensirion SEN66 multi-sensor module, deployed indoors, used to monitor how climate factors and pollutants affect indoor air quality. The dataset covers the period from 2026-01-08 to 2026-03-20. Device The sensor used is the Sensirion SEN66, a compact multi-sensor module that simultaneously measures particulate matter (PM1, PM2.5, PM4, PM10), VOC index, NOx index, temperature, humidity, and CO2 concentration. Archive Contents The archive contains one folder (Device_SEN66) with the following files: Device_SEN66_2026-01-08_to_2026-03-20.csv — Raw data collected from the sensor over the full measurement period. Device_SEN66_2026-01-08_to_2026-03-20_info.txt — Description of the device, sensor parameters, measurement setup, and data collection details. Device_SEN66_2026-01-08_to_2026-03-20_processed.csv — Cleaned and processed version of the raw data. initial_quality_report_Device_SEN66_2026-01-08_to_2026-03-20.txt — Data quality report generated before processing, describing issues found in the raw data. quality_report_after_processing_Device_SEN66_2026-01-08_to_2026-03-20.txt — Data quality report generated after processing, confirming the result of the cleansing steps. Methodology Data was collected at 5-minute intervals using the Sensirion SEN66 sensor module, which integrates all measurements in a single device. Processing Step The raw data went through a structured cleansing process targeting five categories of quality issues identified in indoor sensor datasets: Timestamp misalignment Duplicate records Variable sampling frequency Gaps in the dataset Exceedance of sensor technical limits Data quality was evaluated both before and after processing. The corresponding quality reports are included in the archive. More details about the quality report and statistical characterization of the data can be found in the files initial_quality_report_Device_SEN66_2026-01-08_to_2026-03-20.txt and quality_report_after_processing_Device_SEN66_2026-01-08_to_2026-03-20.txt. Data Format The CSV files contain the following main columns: Column Unit DateTime datetime64 Temperature °C Humidity %RH CO2 ppm VOC Index index (1–500) NOx Index index (1–500) PM1.0 µg/m³ PM2.5 µg/m³ PM4.0 µg/m³ PM10 µg/m³