In Tunisia, O'Connor Associates conducted stack sampling as part of an environmental impact assessment for a steel mill. Levels of nitrogen oxides, sulphur dioxide, total hydrocarbons, carbon dioxide, carbon monoxide, heavy metals and particulates were measured in the offgases from a blast furnace. Results of the analyses were modelled to predict the distribution of the various contaminants in surrounding areas, and a risk assessment was undertaken to evaluate potential environmental concerns.

Stack sampling was also conducted by O'Connor Associates as part of a continuous emission monitoring program for a manufacturer of personal care products. Among other parameters, levels of nitrogen oxides, sulphur dioxide, total hydrocarbons, carbon dioxide, carbon monoxide and particulates were measured in the plant emissions and compared to regulatory criteria. Compliance was assessed based on air dispersion modelling and point-of-impingement concentration predictions conducted by O'Connor Associates.

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