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When downwind from iron smelting,
areas can experience serious environmental and health impacts due to a plume of air pollution. The emissions from a smelter often contain heavy metals and harmful gases that can travel for miles, contaminating soil, water, and air.
Heavy metal contamination
Particulate matter and dust containing heavy metals are released during smelting and carried downwind by air currents, where they settle into the environment.
- Contaminants: The primary toxic metals include lead (Pb), zinc (Zn), iron (Fe), copper (Cu), arsenic (As), and cadmium (Cd).
- Soil and water pollution: These heavy metals accumulate in the surface soil and can leach into groundwater and nearby waterways, threatening aquatic life and contaminating drinking water supplies.
- Food chain contamination: Downwind farming and grazing lands can become contaminated, leading to the intake of pollutants by crops and animals and the potential for human consumption.
- Long-term persistence: The heavy metal contamination of soil can persist for decades, and even after a smelter closes, re-emission from the landscape can continue to be a source of pollution.
Acid rain
Iron smelting releases large quantities of sulfur dioxide (
SO2cap S cap O sub 2
) and nitrogen oxides (
NOxcap N cap O sub x
), which react with atmospheric water vapor to form sulfuric acid.
- Precipitation and deposition: These acidic components eventually fall as acid rain, mist, or dry particles.
- Environmental damage: Acid rain can acidify soil and water, harming forests, crops, and aquatic ecosystems.
- Soil impacts: The increased acidity of soil can also mobilize other toxic elements like aluminum, making them more available for uptake by plants.
Direct health risks for communities
Inhalation and ingestion are the main pathways for human exposure to smelter pollutants. This can lead to a range of health issues, especially in people living in residential areas near a smelter.
- Inhalation exposure: The inhalation of fine particulate matter (
PM2.5cap P cap M sub 2.5
) and volatile organic compounds (VOCs) exacerbates respiratory conditions, including asthma and chronic bronchitis, and is linked to cardiovascular problems.
- Heavy metal poisoning: Chronic exposure to heavy metals like lead and cadmium can cause significant long-term health problems, including damage to the nervous system, reproductive system, and kidneys. Children are especially vulnerable to the effects of lead poisoning.
- Increased cancer risk: Studies have found a correlation between living in proximity to smelters and an increased risk of dying from certain types of cancer, especially lung and digestive tract cancers.