Pollutant Information: Potassium
Category: Heavy metals and base cations
Base cations such as potassium are important in the environment because deposition has an impact upon surface pH, causing an increase in alkalinity, thereby buffering or neutralising the effects of acidity generated by sulphur and nitrogen. It is for this reason these emissions are of interest, rather than their negative impacts upon human health or ecosystems. It was long assumed that the major source of base cations in the air was dust from soil erosion, but patterns of concentrations in air and precipitation also suggest significant emissions from urban and industrial sources. Fireworks are the largest source of potassium emissions in 2015, accounting for 29% of total emissions. Domestic combustion was the second largest source (25%), followed by iron and steel production (24%). Annual total emissions have decreased by 79% between 1970 and 2015 mainly due to the decline in the use of coal by power stations, industry and the domestic sector. However, domestic sector emissions have increased in recent years due to a rise in wood use, which now accounts for 78% of emissions from this source, compared with just 1% in 1970.
Time series graph