Nitrogen dioxide (NO2) measurement

Nitrogen dioxide (NO₂) ( CAS No. 10102-44-0) is a major air pollutant , produced primarily by fuel combustion , industrial processes , and certain photochemical reactions . An irritant and oxidizing gas, it has a direct impact on human health and contributes to the formation of tropospheric ozone and acid rain .

NO₂ measurement allows its concentration to be measured in the air or gases emitted by industrial installations, in order to assess air quality , control emissions and verify regulatory compliance with European environmental standards (Directive 2008/50/EC).

Analytical methods: colorimetry and GC-MS

Nitrogen dioxide analysis can be carried out using several complementary approaches:

• Colorimetry : a classical chemical method based on the Griess-Saltzman reaction , where NO₂ is absorbed in a specific solution and then quantified by absorbance measurement.
• GC-MS (gas chromatography coupled with mass spectrometry) : advanced technique allowing selective and sensitive detection of NO₂ and other nitrogen oxides present in complex gases.
• Automatic analyzers (NDIR, CLD) : for continuous monitoring of NO₂ concentrations in ambient air or process emissions.

These methods guarantee reliable, reproducible measurements that comply with normative requirements (EN 14211, ISO 6768, EPA 7E).

Industrial and environmental applications

Nitrogen dioxide measurement applies to different contexts:

• Ambient air quality monitoring : measurement campaigns in urban, industrial or sensitive areas.
• Industrial emissions control : monitoring of gaseous effluents from boilers, engines, incinerators or chemical plants.
• Environmental impact studies : assessment of atmospheric dispersion and compliance of emissions.
• Research and innovation : development of sensors, filters or pollution control processes.

This analysis can be complemented by the measurement of nitrogen monoxide (NO) or sulfur dioxide (SO₂) for a complete assessment of air pollutants.

Matrices involved

Our partner laboratories perform NO₂ analysis on various matrices:

• Ambient air (indoors, outdoors, industrial areas)
• Industrial or combustion gases
• Emissions from engines, boilers, incinerators
• Work or production facility atmospheres

Each protocol is tailored to the type of sample, the expected concentration levels, and the applicable regulatory requirements.

YesWeLab's expertise

At YesWeLab , we work with an international network of over 200 partner laboratories in France, Europe and internationally , selected for their technical expertise and their ISO 17025 and COFRAC accreditations .

Our scientific team assists you in choosing the analytical method , selecting the specialized laboratory , and providing comprehensive support for your samples , from collection to results delivery. Our digital platform allows you to centralize your analysis requests , obtain quick quotes , and track your services in real time .

Since 2020, many industrial companies, design offices and public actors have trusted us for their air pollution measurements and environmental controls .

Order a nitrogen dioxide (NO₂) analysis

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