In the Waikato, a few large industries produce 80 percent of the industry–generated air emissions.
Most industrial air emissions are released by a relatively small percentage of industrial sites. For example, a recent survey found that over 80 percent of all the industrial air emissions are generated by only nine percent of industrial sites.
Many of these large emission sources are near Tokoroa and Huntly, such as pulp and paper manufacturers and thermal power plants.
However, based on air emission inventory assessments(external link), the overall contribution of industry emissions to total urban airshed emissions is typically small. The industrial contribution to contaminant concentrations in urban airsheds is likely to be even less because industrial discharges are typically via high stacks that promote more effective dispersion of contaminants.
Local landscapes and weather conditions will also influence the effect of these sources on air quality. Find out more about how the weather affects air quality.
Industrial sites can produce a variety of air contaminants, depending on the type of industry and its processes. Industrial emissions include particulates (very small particles - called PM10), combustion gases, volatile organic compounds (VOCs), and odours.
Find out more about fine particles (PM10) as an indicator of air quality.
Air Contaminants in the Waikato describes the effects of these contaminants on the region’s air quality, visibility, human health and the environment.
An assessment of emissions from 107 industrial sites shows that:
The table below shows the percentage of six key contaminants produced by industry types.
|Estimated percentage emission of contaminants by major industry type|
|Quarrying and mining||48.5||0.6||0.2||0.1||1.7||0.1|
|Timber and paper processing||21.3||39.9||5.7||16.0||65.3||23.8|
The Waikato Regional Council is developing an air quality monitoring programme to monitor contaminants.
We require resource consents for activities that might release a significant amount of contaminants into the air. Resource consents set conditions on discharges to air that prevent or limit unwanted effects on air quality so that:
We support industry-based guidelines and codes of practice that help reduce air pollution.