Development and validation of a nitrogen dioxide passive sampler

Area of Science:

• Environmental Science
• Analytical Chemistry
• Air Quality Monitoring

Background:

• Nitrogen dioxide (NO2) is a key indicator of urban traffic-related air pollution.
• Traditional active sampling methods for NO2 are costly and require sophisticated equipment.
• Passive sampling offers a simple, economical approach to air pollutant measurement.

Purpose of the Study:

• To develop and validate a novel passive sampler for measuring ambient nitrogen dioxide (NO2).
• To compare the performance of the developed passive sampler against established active sampling methods.

Main Methods:

• Developed passive samplers using stainless steel filters impregnated with triethanolamine and acetone.
• Conducted simultaneous 24-hour ambient NO2 sampling using both passive and active (modified Saltzman method) techniques.
• Collected data over 18 days in urban locations at 2m height and 15m from pollution sources.

Main Results:

• A strong positive correlation (r = 0.84) was observed between NO2 concentrations measured by the passive and active sampling methods.
• The developed passive sampler demonstrated reliable performance in quantifying ambient NO2 levels.
• Validation confirmed the efficacy of the passive sampling approach.

Conclusions:

• The developed passive sampler provides a viable, cost-effective tool for monitoring urban NO2 pollution.
• This passive method serves as a practical alternative to expensive active sampling techniques.
• The study validates the use of this passive sampler for accurate air quality assessment.