The company claims that there will be no visible smoke from the plant. Well there must be something coming out of the 5 chimneys, otherwise there would be no need for the them. Experience at the WA plant is that pollutants are produced. The Charcoalition want to know not only what is produced under optimum operating conditions, but what is produced under adverse equipment performance and weather conditions, and plant age, etc. The Environmental Impact Statement will hopefully explain this.
The following diagram shows how whatever does come out of those 5 chimneys might drift with various wind conditions.