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<p>Accurate and traceable measurement of ambient ozone is essential for national air quality monitoring and regulatory decision-making. This study presents a comprehensive evaluation of measurement uncertainty associated with ozone analyzer deployed at a Continuous Ambient Air Quality Monitoring Station (CAAQMS) in Delhi, India. The uncertainty budget was developed in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM: JCGM 100:2008) using experimental observations at zero and span concentration levels. Short-term uncertainty was quantified using Allan deviation analysis, while long-term components arising from temperature, pressure, and instrumental drift were systematically evaluated. Results indicate that gas cell pressure variations represent the dominant contributor to total uncertainty, followed by temperature effects and photometric noise. The combined standard uncertainty was estimated as 2.27&#xa0;nmol/mol, with an expanded uncertainty (k = 2) of 4.54&#xa0;nmol/mol, satisfying international regulatory and metrological requirements. The study establishes a metrological benchmark for ozone measurements within the Indian ambient air quality-monitoring framework.</p>

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Estimation of Uncertainty of an Ozone Analyzer Installed at an Ambient Air Quality Station in Delhi

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Priya Dwivedi,
  • Radhakrishnan S. R.

摘要

Accurate and traceable measurement of ambient ozone is essential for national air quality monitoring and regulatory decision-making. This study presents a comprehensive evaluation of measurement uncertainty associated with ozone analyzer deployed at a Continuous Ambient Air Quality Monitoring Station (CAAQMS) in Delhi, India. The uncertainty budget was developed in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM: JCGM 100:2008) using experimental observations at zero and span concentration levels. Short-term uncertainty was quantified using Allan deviation analysis, while long-term components arising from temperature, pressure, and instrumental drift were systematically evaluated. Results indicate that gas cell pressure variations represent the dominant contributor to total uncertainty, followed by temperature effects and photometric noise. The combined standard uncertainty was estimated as 2.27 nmol/mol, with an expanded uncertainty (k = 2) of 4.54 nmol/mol, satisfying international regulatory and metrological requirements. The study establishes a metrological benchmark for ozone measurements within the Indian ambient air quality-monitoring framework.