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Monitoring Industrial Pollution & Toxic Air Dispersion

Solutions >  Industrial Pollution Surveillance

Why Monitor VOCs

Volatile organic compounds (VOCs) are gaseous pollutants emitted from various industrial processes. VOCs are an important source of urban/industrial pollution, by causing photochemical smog and ground-level ozone formation. Toxic VOCs are a concern to public health in urban and industrial area, such as:

  • acute short-term exposure effects through contact and inhalation, include eye/skin irritation, nausea/vomiting and respiratory syndromes

  • public nuisance through chemical odours, e.g. industrial odorants or solvents such as methyl mercaptan and dimethyl sulfide

  • increase risk of cancer in case of prolonged or chronic exposure; e.g. benzene from petrol stations

Reference Sampling & Analysis

VOCs are challenging to measure especially at low ambient concentrations. Reference method analysis must respect strictly quality assurance procedures in field sampling to prevent sample contamination.


APAQ can provide remote sampling based on below method:


EPA TO14A/TO15 - Air Sampling Canister Method

EPA 325A/B - Passive Sampling Method

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Online VOC Monitoring

Thanks to the modern engineering, Automatic Gas Chromatograph (Auto-GC) system exists, which brings the capability of trace VOCs analysis to the field.

The benefits of online monitoring vs. reference sampling method are:

•    Fully automatic, online monitoring to capture trends
•    Can be used for mobile monitoring
•    High data availability and long-term cost savings
•    Embedded calibration standard and quality control


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