Helena Joyce
Domestic pollution, also referred to as household or indoor pollution, is a pressing issue that occurs due to the use of inefficient and polluting fuels and technologies in and around the home. It is a significant problem in developing countries, where solid fuels such as wood, coal, and dung are burned indoors for cooking and heating. This type of pollution is responsible for millions of premature deaths annually, with women and children bearing the brunt of the health burden due to their involvement in household chores. Domestic pollution also extends beyond the confines of individual homes, impacting water bodies and the environment at large. Urban development, industrial activities, and population growth further exacerbate domestic pollution, particularly in densely populated areas.
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What You'll Learn
Household air pollution from inefficient stoves and fuels
Household air pollution is caused by the use of inefficient and polluting fuels and technologies in and around the home. This includes the burning of solid fuels like wood, charcoal, coal, dung, and crop residues in rudimentary stoves or three-stone fires. These inefficient stoves emit black carbon (sooty particles) and methane, which are powerful short-lived climate pollutants.
The World Health Organization (WHO) estimates that around 2.1 billion people worldwide cook using open fires or inefficient stoves fuelled by kerosene, biomass (wood, animal dung, and crop waste), and coal. This generates harmful household air pollution, which was responsible for an estimated 3.2 million deaths per year in 2020, including over 237,000 children under the age of five. The combined effects of ambient air pollution and household air pollution are associated with 6.7 million premature deaths annually.
The use of polluting fuels and technologies also requires significant time for cooking, as well as gathering and preparing fuel. Women and children, who are typically responsible for household chores such as cooking and collecting firewood, bear the greatest health burden from household air pollution. They are exposed to harmful smoke from polluting stoves and fuels, and the ingestion of kerosene by accident is the leading cause of childhood poisonings.
The health risks associated with household air pollution from inefficient stoves and fuels are well-documented. Exposure to household air pollution leads to an increased risk of non-communicable diseases, including stroke, ischaemic heart disease, chronic obstructive pulmonary disease (COPD), and lung cancer. It is also a risk factor for low birth weight, childhood pneumonia, cataracts, and cardiovascular disease.
To reduce household air pollution and protect health, it is essential to expand the use of clean fuels and technologies. This includes solar, electricity, biogas, liquefied petroleum gas (LPG), natural gas, alcohol fuels, and improved biomass stoves that meet the emission targets in the WHO Guidelines. Increasing the use of cleaner, more modern stoves and fuels reduces harmful emissions and personal exposure to household air pollutants.
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Industrial waste and soil pollution
During China's early development, industrial waste was directly discharged into the soil, leading to the initial stages of soil pollution in several provinces. This trend is not unique to China, as similar practices have occurred in other rapidly developing regions. Urban development often correlates with industrial and domestic pollution, and the migration of people to these areas puts a strain on the environment.
Mining activities, for instance, can result in the release of trace elements, wastes, and emissions during the processing of extracted materials. Without proper long-term maintenance, abandoned mining sites can continue to disperse contaminants onto surrounding soils through weathering, water, and wind erosion. Manufacturing industries also introduce various contaminants to the soil, depending on the products and processes involved.
Industrial waste can increase soil concentrations of sodium and other soluble salts to toxic levels, impacting soil salinity and sodicity. Additionally, organic contaminants in industrial waste, such as persistent organic pollutants (POPs), can resist environmental degradation and accumulate in soils. The impact of these pollutants on soil quality, biodiversity, and human health is a growing concern.
To address these issues, effective waste management strategies are crucial. This includes practices such as segregation, land application (composting), landfill, and recycling. Integrating pollution prevention into industrial waste management systems can help minimize environmental and health risks while optimizing costs and worker safety. International bodies and industry associations also play a role in setting standards and providing guidance to improve sustainability and minimize the impact on the environment and public health.
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Domestic waste and water pollution
Domestic pollution is a significant issue, particularly in urban areas. It encompasses various forms, including air pollution, as well as waste generation and the resulting water pollution.
Domestic wastewater is a major contributor to water pollution. Globally, over 80% of domestic wastewater is discharged into water bodies without adequate treatment, leading to increased levels of biological and chemical oxygen demand (BOD and COD) in water, as well as alterations in pH, hardness, inorganic constituents, and pathogen load. This untreated wastewater contains a range of pollutants, including nutrients, oils and grease, detergents, biowastes, household chemicals, heavy metals, bathing and kitchen waste, salts, medicinal constituents, and organic matter.
The improper disposal of domestic wastewater has severe environmental and health consequences. It poses a threat to aquatic and marine life, impacts crop yields, and is responsible for several waterborne and water-related diseases. According to the United Nations, more than 80% of the world's wastewater is released back into the environment without proper treatment, and this figure exceeds 95% in some underdeveloped nations.
Microplastics are another significant concern in domestic wastewater. Modern water treatment plants are currently unable to remove these small, inert particles effectively. As a result, microplastics from sources such as domestic clothes washing end up in watercourses, contributing to global microplastic pollution.
Agricultural activities also play a role in water pollution. The use of fertilizers, pesticides, and animal waste contributes to nutrient pollution, particularly from excess nitrogen and phosphorus. This can lead to toxic algal blooms that are harmful to both people and wildlife.
Domestic Air Pollution
Household air pollution, caused by the use of inefficient and polluting fuels and technologies, is another aspect of domestic pollution. Around 2.1 billion people worldwide rely on open fires or inefficient stoves fuelled by kerosene, biomass, coal, or animal dung for cooking, releasing harmful pollutants into the air. Women and children, who typically spend more time near the domestic hearth and on household chores, bear the brunt of the health impacts, including respiratory infections, heart disease, stroke, and lung cancer.
Soil Pollution
Soil pollution is another consequence of domestic activities. Discarded products with high metal concentrations, chemical alterations in environmental conditions, and the discharge of industrial waste directly into the soil contribute to heavy metal pollution in the soil. This pollution can have complex and diverse sources, particularly in densely populated urban areas.
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Tobacco smoke and secondhand smoke
The only way to completely eliminate exposure to secondhand smoke is to prohibit smoking indoors and in enclosed spaces. Studies have shown that ventilation, filtration, and air cleaning techniques can reduce secondhand smoke but do not eliminate it. Comprehensive smoke-free laws and policies that prohibit smoking in all indoor areas are crucial to protecting non-smokers from secondhand smoke exposure.
Thirdhand smoke (THS) is another concern, referring to tobacco smoke pollutants that persist in the environment even after a cigarette is extinguished. These residual particles can linger on surfaces, household fabrics, and dust, leading to involuntary exposure for non-smokers, especially infants and young children who may crawl on or touch contaminated areas. Research suggests that THS pollutants can remain in homes and cars for months after the last known tobacco use.
Environmental Tobacco Smoke (ETS), also known as secondhand smoke, is a significant health hazard. It consists of Mainstream Smoke, inhaled and then exhaled by the smoker, and Sidestream Smoke, which comes directly from the burning tip of the cigarette. ETS has been linked to various adverse health effects, including eye, nose, and throat irritations, respiratory infections, worsening of asthma, and an increased risk of heart disease and cancers. Living with, working with, or being around a smoker can harm one's health, and the risk of lung cancer for non-smokers exposed to ETS at home or work is significantly elevated.
The impact of tobacco smoke on indoor air quality is substantial, with levels of particulate matter far exceeding those found outdoors. A controlled experiment found that the particulate levels from cigarettes were 10 times higher than those from a diesel engine. Tobacco smoke produces fine particulate matter, which is the most dangerous element of air pollution for health. Therefore, addressing tobacco smoke pollution is crucial to improving indoor air quality and protecting the health of those exposed to secondhand and thirdhand smoke.
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Energy-efficient homes and poor ventilation
Energy-efficient homes are designed to reduce energy consumption and promote a healthier lifestyle. However, poor ventilation in these homes can lead to indoor air pollution, which poses significant health risks.
Mechanical ventilation is crucial in energy-efficient homes to maintain indoor air quality and comfort. There are two primary types of mechanical ventilation systems: spot (exhaust) systems for specific rooms, such as kitchens and bathrooms, and whole-house ventilation systems that provide consistent ventilation throughout the entire building. Exhaust fans in bathrooms and range hoods in kitchens are essential for removing moisture and odors, and they should be vented to the outdoors. Natural ventilation is often insufficient to ensure good indoor air quality, especially in tightly sealed energy-efficient homes.
One effective mechanical ventilation strategy is Energy Recovery Ventilation (ERV), which is designed to minimize energy waste and reclaim energy. ERVs utilize a heat exchanger to efficiently transfer heat and moisture between the outgoing and incoming air, making them suitable for all climates, including humid areas. They can recover up to 80% of the energy in the ventilation system, resulting in significant energy cost savings for homeowners.
Balanced ventilation systems, if properly designed and installed, maintain neutral air pressure in the home by introducing and exhausting equal amounts of fresh outside air and polluted inside air. These systems are appropriate for all climates and can be equipped with filters to remove dust and pollen from the incoming air. However, they may contribute to higher heating and cooling costs as they do not temper or remove moisture from the incoming air.
To enhance ventilation and reduce the strain on mechanical systems, homeowners can utilize natural ventilation by opening windows on clear days when outdoor air quality is healthy. Fresh outdoor air has health benefits and can help clear out stale indoor air during temperate seasons. However, in hot and humid climates, ventilation alone may not be sufficient, and mechanical cooling and dehumidification may be necessary to maintain indoor air quality.
Overall, effective ventilation is crucial in energy-efficient homes to prevent indoor air pollution and ensure a healthy and comfortable living environment for residents. Combining the right mechanical and natural ventilation strategies with high-quality construction can create an efficient and healthy home.
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Frequently asked questions
Domestic pollution is caused by the use of inefficient and polluting fuels and technologies in and around the home. This includes the burning of solid fuels like wood, coal, and dung, which releases harmful pollutants, including fine particulate matter, carbon monoxide, and other toxins. Other sources of domestic pollution include tobacco smoke, cleaning products, and industrial waste.
Domestic pollution can have significant negative impacts on human health. Exposure to indoor air pollution has been linked to various health problems, including respiratory infections, asthma, heart disease, and cancer. It is also a risk factor for acute lower respiratory infections in adults and contributes to childhood pneumonia deaths. In addition, the ingestion of kerosene by accident is the leading cause of childhood poisonings.
Domestic pollution contributes to water pollution, with urban centers discharging toxic chemicals directly into waterways. Industrial waste and runoff of pollutants from urban areas are major sources of water pollution. Domestic pollution also affects soil quality, as waste from industrial production can be discharged directly into the soil, leading to soil pollution.
To reduce domestic pollution, it is important to adopt cleaner sources of energy for cooking and heating, improve ventilation in homes, and use less toxic and environmentally friendly products. On a larger scale, policies and investments that support sustainable land use, cleaner household energy, energy-efficient housing, and better waste management can effectively reduce domestic pollution.
