Greta Jimenez
Natural gas is the primary residential fuel type for heating and cooking in the United States, with approximately a third of Americans cooking with natural gas. However, burning natural gas produces nitrogen dioxide (NO2) and sometimes carbon monoxide, which are harmful to human health and the environment. NO2 is a respiratory tract irritant and can cause coughing and wheezing for people with asthma or other respiratory issues. It is also invisible and odourless, making it difficult to detect. In addition, the combustion of natural gas releases methane, a potent greenhouse gas. Given these concerns, there is a growing movement to electrify homes and replace gas stoves with electric or induction cooktops, which are less polluting.
| Characteristics | Values |
|---|---|
| Primary Constituent | Methane |
| Methane Potency | 86 times more potent than CO2 |
| Primary Pollutant | Nitrogen Dioxide (NO2) |
| NO2 | Respiratory tract irritant |
| Annual Methane Emissions Impact | Comparable to the annual carbon dioxide emissions of 500,000 cars |
| California Standards Comment | "Organizations who are first and foremost interested in electrification for climate concerns" |
| EPA's Science | Homes with gas stoves have around 50% to 400% higher NO2 levels than electric stoves |
| Natural Gas Leaks | Natural gas leaks from transmission and production |
| Gas Stove Emissions | Harmful to human health and the environment |
| Gas Stove Burn | Generates invisible by-products |
| Highest NO2 Risk | Young children, people with asthma, and people with heart or lung disease |
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What You'll Learn
Natural gas cooking is a source of indoor air pollution
Natural gas is the primary residential fuel type for heating and cooking in the United States, with 35% of Americans cooking primarily with natural gas. However, natural gas cooking is a source of indoor air pollution, which can have adverse effects on human health and the environment.
The combustion of natural gas during cooking releases nitrogen dioxide (NO2), a respiratory tract irritant, and other harmful pollutants such as carbon monoxide, formaldehyde, and fine particulate matter (PM2.5). These pollutants can cause or worsen respiratory illnesses, especially in individuals with asthma or other respiratory conditions. Exposure to indoor air pollution from natural gas cooking has been linked to coughing, wheezing, and the development of respiratory issues.
The levels of NO2 in homes with gas stoves can be significantly higher than in those with electric stoves, often exceeding outdoor pollution standards. The lack of proper ventilation in kitchens exacerbates the problem, allowing pollutants to linger and accumulate. Poor ventilation in kitchens with gas stoves can result in indoor air pollution levels that would be considered illegal outdoors.
The gas utility industry has been criticized for downplaying the science on gas stoves and indoor air quality. Environmental groups and researchers advocate for electrifying buildings and transitioning to electric stoves to mitigate indoor air pollution and reduce the climate impact associated with natural gas use.
While complete elimination of natural gas hookups in new residential construction is challenging, households can take steps to improve ventilation during cooking. This includes using range hoods, exhaust fans, and opening windows to reduce the concentration of pollutants in the air.
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Burning natural gas produces nitrogen dioxide (NO2)
Nitrogen oxides are produced in significant amounts in hotter flames, such as those in internal combustion engines. However, the yield of nitrogen oxides in low-temperature flames, like those in gas cookers or Bunsen burners, is usually minimal.
When natural gas is burned for cooking, it releases nitrogen dioxide (NO2), carbon monoxide, formaldehyde, and other harmful pollutants. These emissions can build up to unhealthy levels indoors if the cooking appliances are not adequately vented to the outside. Poor ventilation in kitchens can lead to unhealthy air to breathe, and the risk of exposure to pollutants is higher for individuals with pre-existing medical conditions or respiratory illnesses.
NO2 is a respiratory tract irritant and can cause adverse health effects, particularly for vulnerable populations. It contributes to particle pollution and the formation of ozone, leading to smog. As a pollutant, NO2 can be observed through satellite imagery, and its levels in the atmosphere are decreasing.
To mitigate the impact of nitrogen dioxide pollution from cooking with natural gas, proper ventilation is crucial. This includes using a range hood over the stove, inspecting gas stoves annually for gas leaks, and ensuring adequate airflow by opening windows or exterior doors while cooking.
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NO2 exposure is linked to respiratory illnesses
Nitrogen dioxide (NO2) is a respiratory tract irritant that is released into the air during gas cooking. Poor ventilation in kitchens can lead to high levels of indoor air pollution, which can be unhealthy to breathe. NO2 exposure can irritate the airways in the human respiratory system, aggravate respiratory diseases, and cause respiratory symptoms such as coughing, wheezing, or difficulty breathing.
Studies have shown that exposure to NO2 is linked to an increased risk of respiratory illnesses. For every 10 μg/m3 increase in NO2 above the WHO-recommended 24-hour threshold, there is a corresponding increase in the relative risk of respiratory health service attendances. Specifically, a 10-unit increase in NO2 above the WHO threshold was associated with a lagged relative risk of 1.49 for GP respiratory attendances and 1.98 for A&E respiratory visits. These visits due to high pollution events can persist up to 100 days post-exposure, indicating the long-lasting impact of NO2 exposure on respiratory health.
Short-term exposure to high concentrations of NO2 can cause adverse respiratory effects, especially for those with asthma. It can lead to coughing, wheezing, and difficulty breathing, resulting in hospital admissions and emergency room visits. Prolonged exposure to elevated levels of NO2 may also contribute to the development of asthma and increase susceptibility to respiratory infections. People with asthma, children, and the elderly are generally at greater risk of experiencing the harmful health effects of NO2.
In addition to respiratory impacts, NO2 exposure has been linked to a range of other health issues. Elevated levels of NO2, along with particulate matter and sulfur dioxide, are associated with heart and lung harm, adverse pregnancy and birth outcomes, and potentially increased risks of kidney and neurological harm, autoimmune disorders, and cancer.
To mitigate the risks associated with NO2 exposure during gas cooking, it is essential to ensure proper ventilation in the kitchen. The use of a high-efficiency range hood over the stove and exhaust fans can help reduce NO2 levels. Opening windows and exterior doors can also improve airflow and reduce the concentration of pollutants.
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Natural gas cooking contributes to carbon pollution
Natural gas is the primary residential fuel type for heating and cooking in the United States, with 15% of all-natural gas use attributed to residential consumers. However, burning natural gas for cooking contributes to carbon pollution.
Natural gas stoves can release carbon monoxide, formaldehyde, and other harmful pollutants into the air, which can be toxic to people and pets. The primary pollutant of concern emitted by gas cooking is nitrogen dioxide (NO2), a respiratory tract irritant that can cause coughing and wheezing for people with asthma or other respiratory issues. Prolonged exposure to NO2 can also contribute to the development of respiratory conditions. Homes with gas stoves can contain 50 to 400% higher concentrations of NO2 than homes with electric stoves, often resulting in levels of indoor air pollution that would be illegal outdoors.
In addition to NO2 emissions, natural gas cooking contributes to carbon pollution through methane leaks in the distribution system, especially in older cities. Methane is the primary constituent of natural gas and is a potent greenhouse gas that is 86 times more potent than CO2. These leaks add up and significantly impact the climate, as methane has a climate impact comparable to the annual carbon dioxide emissions of 500,000 cars.
Given the health and environmental risks associated with natural gas cooking, there is a growing push to electrify home appliances and transition to electric stoves, which reduce air pollutants, greenhouse gases, and consumer costs over the long term. While natural gas stoves may not be banned outright, households, especially those with individuals suffering from respiratory illnesses, should consider switching to electric alternatives to mitigate their impact on carbon pollution.
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The natural gas industry opposes electrification
Natural gas is the primary residential fuel type for heating and cooking in the United States, with 15% of all natural gas use attributed to residential consumers. Methane, the primary constituent of natural gas, is a potent greenhouse gas that is 86 times more potent than CO2. Burning gas emits pollutants that can cause or worsen respiratory illnesses. The primary pollutant of health concern emitted uniquely by gas cooking is nitrogen dioxide (NO2), a respiratory tract irritant.
One of the arguments used by the natural gas industry is that natural gas is a cleaner energy choice compared to coal and oil. They emphasize consumer choice and frame initiatives to limit gas use as a restriction on that choice. The industry also highlights the cost factor, claiming that non-gas alternatives are too expensive. Additionally, they downplay the existing science on gas stoves and indoor air quality, pointing out that federal regulators have not imposed stricter regulations on gas stoves.
As the prices of renewable electricity and electric equipment continue to drop, electrification becomes an increasingly attractive option. Electrically driven equipment offers lower maintenance costs, and in some cases, lower investment costs. The transition away from direct fossil fuel use in buildings is crucial for decarbonization and meeting climate targets. McKinsey projects that renewables could produce more than half of the world's electricity by 2035, at lower prices than fossil fuel generation.
While the natural gas industry fights to preserve its business, environmental groups and experts advocate for the elimination of natural gas use in buildings, including cooking with gas stoves, to mitigate climate change and improve indoor air quality.
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Frequently asked questions
Yes, cooking with natural gas is polluting. Burning natural gas releases nitrogen dioxide (NO2) and sometimes carbon monoxide, formaldehyde, and other harmful pollutants.
Nitrogen dioxide is a respiratory tract irritant and can cause coughing and wheezing for people with asthma or other respiratory issues. Prolonged exposure to nitrogen dioxide can contribute to the development of respiratory conditions.
Electric stoves are a less-polluting alternative to natural gas. While electricity may come from fossil fuels, the combustion happens at a power plant away from your home.
If you have a natural gas stove, ensure it is inspected annually by a qualified technician for gas leaks and carbon monoxide. You can also improve ventilation in your kitchen by using a range hood or exhaust fan and opening windows or doors.
Natural gas cooking can cause or worsen respiratory illnesses. Young children, people with asthma, and people with heart or lung disease are especially vulnerable to the harmful effects of indoor air pollution.
