Helena Joyce
Indoor air pollution is a pressing issue in India and China, causing millions of premature deaths each year. In 2019, India and China accounted for half of the world's total deaths caused by air pollution, with 1.67 million and 1.85 million deaths, respectively. This issue is especially concerning in developing countries, where indoor air pollution can be up to 10-13 times worse than outdoor pollution due to poor ventilation, heat, and humidity. The primary sources of indoor air pollution are combustion, building materials, and bioaerosols, with solid fuel usage for cooking and heating being a significant contributor. While the specific causes and impacts of indoor air pollution differ between India and China, both countries face significant challenges in reducing it and mitigating its health, social, and economic consequences.
Characteristics and Values of Indoor Air Pollution in India and China
| Characteristics | Values |
|---|---|
| India | |
| Principal sources of indoor air pollution | Combustion, building material, and bioaerosols |
| Percentage of households relying on solid biomass for cooking | 76% |
| Percentage of deaths in 2019 that could be traced to air pollution | 20% (1.67 million) |
| Pollutants | Particulate matter, carbon monoxide, sulfur dioxide, benzene, nitrogen dioxide, etc. |
| Government initiatives | National Clean Air Programme, providing access to liquified petroleum gas, etc. |
| China | |
| Improvements in air quality | Significant |
| Policy approach | Centralized target-setting and implementation |
| Leading cause of air-pollution-related health issues | Exposure to ambient PM2.5 pollution |
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What You'll Learn
Solid fuels used for cooking and heating
In India, approximately 76% of households in rural areas rely on solid biomass for cooking. This includes firewood, cow dung cakes, coal, charcoal, kerosene, and liquefied petroleum gas (LPG). The combustion of these solid fuels releases harmful pollutants such as suspended particulate matter, carbon monoxide, polyaromatic hydrocarbons, and formaldehyde, which have severe health impacts.
Similarly, in China, a study found that about 52% of participants, especially those in rural areas, reported using solid fuels such as coals or charcoal for cooking and heating. The use of solid fuels has been associated with increased all-cause mortality, particularly among the mid-aged and elderly population. The indoor burning of solid fuels can lead to elevated levels of harmful pollutants such as PM, NO2, and SO2, which can have detrimental effects on respiratory and cardiovascular health.
The impact of solid fuel use on indoor air quality and health is so significant that the Indian government has committed to reducing the number of households that use solid fuels for cooking by 50%. This commitment recognizes the urgent need to address the health risks associated with solid fuel combustion, which contributes to the high number of deaths attributed to air pollution in India.
In summary, the use of solid fuels for cooking and heating is a major contributor to indoor air pollution in India and China, particularly in rural areas. The combustion of these fuels releases harmful pollutants, leading to increased health risks, including respiratory and cardiovascular issues, and even mortality. Addressing the use of solid fuels and promoting cleaner alternatives is crucial to improving indoor air quality and protecting the health of vulnerable populations in these countries.
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Poor ventilation, heat, and humidity
While outdoor air pollution is a significant issue in India and China, it is also important to consider the causes of indoor air pollution. Poor ventilation, heat, and humidity can all contribute to indoor air pollution and have adverse effects on human health.
Poor ventilation can cause or worsen indoor air pollution by trapping pollutants inside the home. For example, fuel-burning appliances such as cooking stoves, furnaces, and water heaters can emit harmful pollutants into the indoor air. Without proper ventilation, these pollutants can accumulate and lead to health issues such as lung cancer and chronic lung diseases.
Heat also plays a crucial role in indoor air quality. Warmer air near the ground rises, carrying pollutants to higher altitudes. This phenomenon, known as convection, is influenced by air temperature and affects the movement of indoor air pollutants. During winter, warm air can act as a lid, trapping cold air and pollution close to the ground, a condition known as thermal inversion. Thermal inversions are more common in cities and can trap pollutants such as vehicle and factory exhaust, contributing to poor indoor air quality.
Additionally, humidity levels have a direct impact on indoor air quality. The amount of water vapor in the air can influence pollutant concentrations. High humidity levels can lead to irritating odors, particles, and vapors, reducing indoor air quality and occupant comfort. Excessive indoor dampness can also promote the growth of mold, dust mites, cockroaches, bacteria, and viruses, which can have negative health consequences.
To mitigate the effects of poor ventilation, heat, and humidity on indoor air quality, it is important to ensure proper ventilation in homes, especially when using fuel-burning appliances. Maintaining balanced humidity levels and taking steps to prevent and address mold and pest issues can also help improve indoor air quality and protect the health of occupants.
In summary, poor ventilation, heat, and humidity are interconnected factors that contribute to indoor air pollution in India, China, and other parts of the world. By understanding their impact and taking proactive measures, individuals can improve indoor air quality and create healthier living environments.
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Industrialization and manufacturing outputs
India's industrialization and manufacturing outputs have resulted in high levels of outdoor air pollution, which can indirectly impact indoor air quality. The use of solid biomass fuels, such as firewood (49%) and cow dung cakes (8.9%), for cooking and heating in Indian households, particularly in rural areas, contributes to indoor air pollution. The incomplete combustion of these biomass fuels releases harmful pollutants such as suspended particulate matter, carbon monoxide, polyaromatic hydrocarbons, and formaldehyde. These pollutants accumulate in enclosed spaces, leading to indoor air quality being up to ten times worse than outdoor air quality.
In China, the expansion of coal-powered industries, particularly the steel industry, has been a key driver of air pollution. While China has plans to reduce coal consumption, the construction of new coal-powered power plants and the increasing demand for coal-generated electricity pose significant challenges to improving air quality. The use of coal by households, especially in rural areas, also contributes to indoor air pollution, as emissions from burning coal are less filtered compared to industrial sources.
Additionally, the transportation sector in both countries contributes to indoor air pollution. In India, vehicles account for 27% of particulate air pollution, with some taxis and auto-rickshaws running on adulterated fuel blends that increase emissions of harmful pollutants. China's growing number of vehicles, reaching 360 million in 2020, has made them a major source of air pollution. The emissions from vehicles can indirectly impact indoor air quality, especially in densely populated urban areas.
To address the issue of indoor air pollution caused by industrialization and manufacturing outputs, both India and China have implemented measures to improve air quality. India has committed to reducing the number of households relying on solid fuel for cooking and transitioning to cleaner energy sources. China has also targeted large industries to reduce emissions and is working to improve energy efficiency and reduce pollution from other sources, such as vehicles.
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Population growth and urbanization
India's population is growing, and the country is rapidly urbanizing. As a result, India is suffering from severe air pollution. India's population is projected to be 53% urban by 2050, with an addition of 416 million urban dwellers. The North Indian River Plain houses most of India's population, with almost one billion people living in this area. The increase in population and industrialization has been stated as one of the key reasons for high aerosol loading in the Indian subcontinent.
The growing population and urbanization are causing congested roads in cities, reducing average vehicular speed and resulting in higher vehicular emissions. India's air pollution is caused by industrial pollution (51%), vehicles (27%), crop burning (17%), and other sources (5%). The Indian government has committed to introducing 1,000 electric public transport buses to its existing 550 buses and upgrading all fossil fuel combustion engine vehicles to BS6 emission standards.
The use of fuelwood and biomass burning for cooking and heating is also a significant contributor to India's air pollution. Around 49% of people use firewood, and 8.9% use cow dung cakes for cooking. Some reports claim that 300,000 to 400,000 people die of indoor air pollution and carbon monoxide poisoning in India annually because of biomass burning. The Indian government has committed to reducing the number of households using solid fuel for cooking by 50%.
In China, rapid urbanization and industrial growth have caused severe air pollution over the past decade, leading to public health crises and social tensions. China's policy efforts have achieved significant improvements in air quality, while India's policies have been largely ineffective. China's approach features centralized target-setting and implementation, with policies enforced primarily through top-down administrative lines. India's approach reflects the division of power between central and state governments and relies on legislative and judiciary systems for accountability.
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Caste and income-based disparities
Indoor air pollution in India is a severe issue, with an estimated 670,000 deaths attributed to it annually. It is caused by various factors, including industrial and vehicular emissions, construction, waste burning, and the use of wood and dung for cooking and heating by low-income and rural households.
Low-income households in India rely on solid fuels, such as firewood, cow dung cakes, coal, charcoal, kerosene, and liquefied petroleum gas (LPG), for cooking and heating. These fuels release harmful pollutants, including suspended particulate matter, carbon monoxide, polyaromatic hydrocarbons, and formaldehyde, which have severe health impacts. The incomplete combustion of biomass fuels, such as firewood and cow dung, contributes significantly to indoor air pollution and is prevalent in low-income households.
The Indian government has attempted to address this issue by providing modified biomass cook stoves and liquefied petroleum gas (LPG) to low-income households through programs like the Pradhan Mantri Ujjwala Yojana. However, these efforts have faced challenges due to inconsistent subsidies, rising fuel costs, and a lack of understanding of low-income households' energy needs.
Additionally, caste and income-based disparities interact with other factors to exacerbate indoor air pollution. For example, marginalized and lower-caste communities are more exposed to pollution from coal-fired power plants, and poorer states in eastern India bear the brunt of PM2.5-related mortality from electricity generation. Socioeconomic factors, such as caste, religion, poverty, education, and access to household amenities, are important risk factors for PM2.5 exposures.
To effectively reduce indoor air pollution and address caste and income-based disparities, policymakers must increase LPG subsidies for poor households, improve their understanding of low-income households' energy needs, enhance education about the long-term impacts of indoor air pollution, and resolve issues with subsidy payments and the delivery of gas cylinders to needy homes.
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Frequently asked questions
The main cause of indoor air pollution in India is the use of solid fuels for cooking, such as firewood, cow dung, charcoal, and coal. These fuels release toxic pollutants including carbon monoxide, sulfur dioxide, particulate matter, and benzene, which are linked to various health issues.
Indoor air pollution in India has been linked to an increased risk of various diseases, including pneumonia in children, chronic obstructive pulmonary disease, and cancer. It is also associated with poor perinatal outcomes, such as low birth weight and perinatal death.
The main causes of indoor air pollution in China are household solid fuel usage, industry, transportation, and coal power plants. The burning of fossil fuels, particularly coal, is a significant contributor, with coal being the largest source of greenhouse gas emissions and air pollutants in the country.
