Nitrogen dioxide (NO2) determination

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.

reliable, reproducible measurements (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.

Affected matrices

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 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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