The past few years have shown a gradual increase in the amount of sulphur compounds emitted into Hinton's air. Measured in concentrations of total reduced sulphur (TRS), the local presence of the compounds has increased by more than 50 per cent since 2009, showing an average presence of 1.44 parts per billion in Hinton's air in 2012.
While this is still well under the provincial limit, on at least 30 days last year the 3 parts per billion threshold was exceeded for the average reading over a 24-hour period. The 10 ppb limit was also surpassed for 132 hours in 2012, producing the rotten egg smell many Hinton residents are familiar with.
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