SIST EN ISO 11771:2011 PDF

Overview

EN ISO 11771:2010 (Air quality - Determination of time‑averaged mass emissions and emission factors - General approach) provides a generic, measurement‑based framework for deriving time‑averaged mass emissions and emission factors from stationary sources. The standard defines how to collect and combine concentration and gas‑flow data, calculate mass emission rates, estimate uncertainties (including expanded uncertainty of averages), and report results in a form usable for emission inventories, air‑quality modelling and other applications. It is compatible with ISO 14064‑1 and ISO 14064‑3.

Key topics and requirements

• Measurement‑based methods: Requires empirical measurement of concentrations and gas flows (manual or automatic) or calculation methods that rely on such measurements.
• Mass emission rate determination: Simultaneous measurement of pollutant concentration and volumetric/stack gas flow to derive instantaneous mass emission rates.
• Time‑averaging and gap filling: Procedures to produce representative time series and generate complete datasets for defined reporting periods (e.g., calendar year) by numerically combining and filling gaps.
• Emission factor calculation: Defines how to calculate time‑averaged emission factors (mass per unit activity) for a specific installation or family of installations, including aggregation methods.
• Uncertainty estimation: Guidance on quantifying measurement uncertainty, variability in time series, and the expanded uncertainty of time‑averaged rates and emission factors.
• Activity data: Collection, treatment and uncertainty assessment of activity statistics used with emission factors (m = a·F).
• Quality management: Requirements for a quality management system to support inventory quality assurance and verification.
• Reporting: Standardized reporting content to ensure emission factors and mass emissions are traceable and usable.

Applications and who uses it

• Environmental consultants preparing emission inventories and site‑specific emissions estimates.
• Industrial operators and environmental managers quantifying stack emissions for greenhouse gases and air pollutants (including fine particulate matter) where calculation from fuel or material balance is impractical.
• Air quality modellers and policy analysts needing robust, time‑averaged emissions or emission factors for modelling and scenario analysis.
• Auditors and verification bodies assessing inventory data quality (note: the standard does not itself set compliance monitoring procedures for regulatory emission limits).
• Researchers developing or validating emission factor databases.

Related standards

• ISO 14064‑1 and ISO 14064‑3 (compatibility noted).
• Measurement methods referenced in ISO 11771 (see standard bibliography) - the standard relies on those established measurement procedures rather than reproducing them.

Keywords: EN ISO 11771:2010, air quality, time‑averaged mass emissions, emission factors, uncertainty estimation, measurement‑based methods, emission inventory, stationary sources.