Dataset description

	These data files contain calibrated measurements of ambient air methane (CH₄) and carbon dioxide (CO₂) mole fractions collected using a Picarro G1301 cavity ring-down spectrometer. Measurements were conducted inside a boiler room between July 25, 2024 and July 17, 2025.
	The objective of this measurement campaign was to characterize methane enhancements in the boiler room and produce a dataset suitable for estimating methane emissions associated with building-level combustion and gas infrastructure.


File format

	The data files are provided as ASCII text files (CSV format) with the following characteristics:
		- Missing values are represented by the string "NaN".
		- Variables are separated by commas (,).
		- Records are separated by newline characters (\n).
		- The first line of each file contains a header row describing the variable names.
		- Time stamps are reported in UTC.


Instrumentation

	Measurements were performed using a Picarro G1301 cavity ring-down spectrometer configured for continuous monitoring of CH₄, CO₂, and H₂O mole fractions.

	All reported gas mole fractions were:
		- Corrected for water vapor dilution, and
		- Calibrated using periodic reference gas measurements.


Variables included in the dataset: 
	- Time_utc: Time of measurement in UTC, formatted as YYYY-MM-DD hh:mm:ss.sss.
	- Instrument: Instrument model used for data collection (Picarro G1301).
	- CH4_raw_ppm: Raw ambient air methane mole fraction measured by the instrument in ppm.
	- CH4_dry_ppm: Ambient air methane mole fraction corrected to dry air in ppm. 
	- CH4_calibrated_ppm: Calibrated ambient air methane mole fraction in ppm. 
	- CO2_raw_ppm: Raw ambient air carbon dioxide mole fraction measured by the instrument in ppm. 
	- CO2_dry_ppm: Ambient air carbon dioxide mole fraction corrected to dry air in ppm.
	- CO2_calibrated_ppm: Calibrated ambient air carbon dioxide mole fraction in ppm. 
	- H2O_raw_percent: Raw ambient air water vapor mole fraction measured by the instrument in %.
	- H2O_reported_percent: Corrected ambient air water vapor mole fraction in %.
	- Cavity_Pressure_torr: Gas pressure in the instrument optical cavity in Torr.
	- Cavity_Temperature_celsius: Optical cavity temperature in °C.


Notes on data processing

	- Dry mole fractions (*_dry_ppm) are computed by correcting raw wet mole fractions for water vapor dilution using the measured H₂O mole fraction.
	- Calibrated mole fractions (*_calibrated_ppm) are obtained by applying instrument-specific calibration factors derived from reference gas measurements.
	- For most scientific analyses, including emission estimation, calibrated dry mole fractions should be used.