Meghan Hodges
Ammonia (NH3) is a compound of nitrogen and hydrogen that is commonly used as a fertilizer and across various industries. While it has many uses, ammonia is also recognized as a hazardous air pollutant that negatively impacts biodiversity and the natural environment. Ammonia pollution is caused by agricultural practices, industrial machinery, and vehicles, among other sources. It affects both terrestrial and aquatic ecosystems, leading to decreased biodiversity and the death of aquatic organisms. To combat this, some countries have implemented policies to reduce ammonia emissions, such as the Gothenburg Protocol and the National Emission Ceilings Directive in the European Union.
| Characteristics | Values |
|---|---|
| Ammonia pollution control methods | Gothenburg Protocol, Directive on Integrated Pollution Protection and Control, National Emission Ceilings Directive |
| Common sources of ammonia pollution | Agriculture, industrial machinery, petrol vehicles, fertilizer factories, coal mines, landfills |
| Effects of ammonia pollution | Acidification of freshwater ecosystems, eutrophication, toxic algae, decreased biodiversity, adverse health effects |
| Detection and measurement techniques | Filter packs, fabric denuders, satellite imaging, rainwater analysis |
| Strategies to reduce ammonia emissions | Conservation agriculture practices, proper storage and spreading of manure and fertilizers, housing animals in covered areas |
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What You'll Learn
- Ammonia is a major air pollutant, contributing to PM2.5 and reacting with other gases to form harmful particles
- Its use in agriculture, especially with manure and fertilisers, is a significant source of emissions
- Water and soil ecosystems are harmed by ammonia, reducing biodiversity and causing acidification
- Methods to measure ammonia pollution include filter packs, fabric denuders, satellite imaging and rainwater analysis
- Some countries have implemented policies to reduce ammonia emissions, with a focus on agricultural practices
Ammonia is a major air pollutant, contributing to PM2.5 and reacting with other gases to form harmful particles
Ammonia is a colourless gas with a distinct odour. It is a major air pollutant, contributing to PM2.5 and reacting with other gases to form harmful particles. Ammonia is produced by farms, through fertilisers and livestock, as well as certain petrol vehicles and industrial machinery. In the United States, farm animals are the greatest contributor to gaseous ammonia emissions.
Ammonia is a compound of nitrogen and hydrogen. When it is in the atmosphere, it can react with other compounds to form harmful pollutants. These emissions can then land on different surfaces, affecting ecosystems and water quality. Ammonia is one of the main sources of nitrogen pollution. When nitrogen compounds, including ammonia, enter soil and water in large amounts, they can have a detrimental impact on ecosystems. For example, in nitrogen-contaminated water, algae can proliferate faster than usual, blocking sunlight for other plants.
Ammonia emitted from livestock operations contributes to the formation of fine particulate matter (PM2.5), which is considered a significant environmental risk to human health. Ammonia reacts with atmospheric nitric and sulfuric acids to form PM2.5 (nitrate and sulfate). Across different regions of the United States and under various weather conditions, PM2.5 formed from ammonia emitted by livestock operations was estimated to contribute between 5% and 11% of total PM2.5 concentrations. In certain areas, such as the North Central region, and during cool weather, the contribution can be as high as 20%.
In the air, ammonia mixes with other gases, including sulphur dioxide and nitrogen dioxide, to form fine particulate matter containing ammonium. Breathing in these tiny particles can be harmful to human health. They are particularly detrimental to the heart and lungs and have been linked to heart attacks, strokes, chronic obstructive pulmonary diseases, asthma, and lung cancer.
Ammonia is also a severe irritant and can cause eye, skin, and respiratory tract irritation. Exposure to high concentrations of ammonia can lead to eye injuries, conjunctivitis, tear production, swelling, and temporary or permanent blindness. In addition, ammonia is a toxic gas that can be corrosive to tissues upon contact in sufficient quantities. It can also emit toxic fumes when heated to decomposition.
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Its use in agriculture, especially with manure and fertilisers, is a significant source of emissions
Ammonia (NH3) is widely used in agriculture, especially in fertilisers and manure, and its use has significantly contributed to air pollution. Agriculture accounts for over 81% of global ammonia emissions, with crop production being a major source of atmospheric ammonia.
Ammonia emissions from agriculture have severe implications for human health and ecosystems. Atmospheric ammonia contributes significantly to air pollution, particularly fine particulate matter (PM2.5), which can penetrate deep into the lungs, causing respiratory issues and long-term illnesses such as Chronic Obstructive Pulmonary Disease (COPD) and lung cancer. Reducing ammonia emissions from agricultural practices is crucial to mitigate these health risks and protect air quality.
In agricultural settings, ammonia is released during the decomposition of plant and animal waste. It is also emitted during the application of synthetic nitrogen fertilisers. The use of fertilisers in crop production has been identified as a significant contributor to global ammonia emissions. Efforts to reduce ammonia emissions from fertilisers are vital to minimise their environmental impact.
The management of manure and fertilisers plays a critical role in controlling ammonia emissions. Water contaminated with fertiliser ammonia, for instance, must be prevented from entering storm drains, rivers, wetlands, or lakes, as it can be lethal to aquatic life even at extremely low concentrations. Proper management practices can help reduce emissions and protect both human health and the environment.
Machine learning models have been developed to generate crop-specific NH3 emission factors, aiding in the estimation of global NH3 emissions and the identification of effective mitigation strategies. These models consider fertiliser management practices and provide valuable insights for informed decision-making in agriculture to reduce ammonia emissions and their associated environmental and health impacts.
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Water and soil ecosystems are harmed by ammonia, reducing biodiversity and causing acidification
Ammonia (NH3) is a compound of nitrogen and hydrogen that is commonly used as a fertiliser and across various industries. While it has many uses, ammonia is also recognised as a hazardous air pollutant that negatively impacts biodiversity and ecosystems. Water and soil ecosystems are particularly harmed by ammonia through acidification and reduced biodiversity.
Ammonia is produced by bacteria in water and soil as a result of plant and animal waste decomposition. It is found in low, non-toxic concentrations in nature, but human activities have increased ammonia emissions, causing harm to the environment. Ammonia pollution in water ecosystems, for example, can lead to eutrophication, where excessive nutrients cause the growth of algae that kills other aquatic life and creates dead zones. This process also blocks sunlight for plants, and the decomposition of algae consumes oxygen in the water, suffocating aquatic organisms.
In soil ecosystems, ammonia increases soil acidity (decreased pH) through the process of nitrification. Bacteria convert ammonia into nitrate, producing hydrogen ions that lower the soil pH. This increased soil acidity reduces the ecosystem's resilience to cold temperatures, droughts, diseases, and invasive species.
Agricultural practices are a major source of ammonia emissions, with farms contributing nearly 90% of emissions in the UK. When substances containing ammonia, such as manure and fertilisers, are applied to fields or stored in open pits, they release ammonia gas into the air through evaporation. This evaporated ammonia can then mix with other gases in the air, forming harmful pollutants that affect human health when inhaled.
To address the negative impacts of ammonia on water and soil ecosystems, some countries have implemented reduction strategies. The European Union, for example, has policies such as the Gothenburg Protocol and the National Emission Ceilings Directive to control and reduce ammonia emissions. These efforts recognise the importance of mitigating ammonia pollution to protect biodiversity and maintain the health of aquatic and terrestrial ecosystems.
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Methods to measure ammonia pollution include filter packs, fabric denuders, satellite imaging and rainwater analysis
Methods to measure ammonia pollution include filter packs, fabric denuders, satellite imaging, and rainwater analysis.
Filter packs are used to sample acid gases and aerosols, as well as NH3/NH4+. The sampling train includes two sets of coated filter papers in a 2-stage filter pack that collects aerosol components. The first filter collects data on aerosol NO3-, SO42-, Cl-, Na+, Ca2+, and Mg2+, while the second filter, coated with citric acid, collects data on aerosol NH4+.
Fabric denuders are another method used to detect ammonia. These are glass tubes coated internally with citric acid, which attracts NH3 gas molecules. The coating creates a visible layer, allowing for a quality check. Two denuders are used in series to detect any breakthrough from the first tube, with the data from the second used for quality assurance.
Satellite imaging has been used by NASA since 2008 to monitor ammonia emissions. Satellites measure gas signatures in the atmosphere, charting the prevalence of ammonia and identifying areas of high concentration. This method helps to fill spatial gaps in ground monitoring networks, which are sparse and often lack long-term data.
Finally, rainwater analysis is a technique used to measure ammonia pollution. Buckets of rainwater are collected and tested for ammonia using techniques such as Nessler's reagent and a spectrophotometer. This provides the concentration of ammonia trapped in atmospheric water vapour.
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Some countries have implemented policies to reduce ammonia emissions, with a focus on agricultural practices
Ammonia (NH3) is a chemical compound of nitrogen and hydrogen, which is a byproduct of agriculture and industry. It is a major pollutant, affecting both terrestrial and aquatic ecosystems, and contributing to air pollution. The level of ammonia in the atmosphere was more than twice as large in 2010 as it was in 1940, and emissions are expected to increase significantly by 2100. As a result, several countries have implemented policies to reduce ammonia emissions, with a particular focus on agricultural practices.
Ammonia emissions from agriculture are a significant concern due to their contribution to fine particulate matter (PM2.5), which has adverse effects on human health. Inhalation of PM2.5 can lead to respiratory issues, including reduced lung function, throat and eye irritation, and increased coughing. Long-term exposure to PM2.5 has been linked to the development of chronic obstructive pulmonary disease (COPD) and lung cancer. Reducing ammonia emissions from agriculture can, therefore, help protect human health and reduce economic losses associated with the treatment of related illnesses.
Agricultural practices, such as fertilizer application and manure handling, are major sources of ammonia emissions. Conservation agriculture practices can play a crucial role in reducing these emissions. Implementing sustainable farming methods, such as precision farming, can help minimize the use of fertilizers and improve manure management, thereby reducing ammonia emissions. Additionally, regulating the storage and handling of agricultural waste can further decrease ammonia pollution.
Some countries and regional blocs have taken steps to address ammonia emissions. For instance, the European Union (EU) has implemented several policies to curb ammonia pollution. The Gothenburg Protocol, the Directive on Integrated Pollution Protection and Control, and the National Emission Ceilings Directive all aim to reduce NH3 emissions. The United Kingdom, an EU member, has set a target of cutting emissions by 16% by 2030. These policies demonstrate a recognition of the harmful effects of ammonia pollution and a commitment to mitigating its impact on the environment and human health.
While progress has been made, more comprehensive action is needed to address the issue effectively. Further research and the implementation of science-based policies are crucial to reducing ammonia emissions and minimizing their negative consequences on a global scale. This includes improving emission estimates, particularly in regions with discrepancies, such as Europe and the United States, and utilizing process-based approaches that consider the bidirectional nature of ammonia. By focusing on agricultural practices and adopting sustainable methods, countries can make significant strides toward reducing ammonia emissions and improving air quality, ecosystems, and public health.
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Frequently asked questions
Ammonia is not used to control air pollution, but it is a major cause of air pollution.
Ammonia is a compound of nitrogen and hydrogen. It is emitted as a gas from rotting agricultural slurry, fertiliser factories, and certain types of industrial machinery. In the air, ammonia reacts with other gases, including sulphur dioxide and nitrogen dioxide, to form fine particles of ammonium salts. These particles are harmful to human health when breathed in.
Some countries have implemented policies to reduce ammonia emissions, such as the Gothenburg Protocol and the Directive on Integrated Pollution Protection and Control in the European Union. To reduce ammonia emissions, industrial-scale farms can change the way they store and spread manure and fertilisers. For example, keeping manure piles and slurry pits covered prevents ammonia from evaporating into the air.
