Helena Joyce
Louisiana is a state in the Deep South and South Central regions of the United States, with a population of around 4.6 million people. In recent years, Louisiana's air quality has worsened, with a particular increase in toxic levels of cancer-causing chemicals. This is due to a variety of factors, including the rapid growth of the chemical industry, the approval of new industrial plants, and the state's abundance of petroleum and natural gas reserves. The state's capital, Baton Rouge, has been ranked as one of the most polluted cities in the US due to its high levels of ozone pollution. Louisiana's air pollution is caused by a range of toxic air pollutants, including benzene, perchloroethylene, methylene chloride, toluene, and dioxin. These pollutants have serious health effects, including respiratory issues, heart problems, and cancer.
| Characteristics | Values |
|---|---|
| Particulate matter | PM2.5 and PM10 |
| Ozone | O3 |
| Sulphur dioxide | SO2 |
| Nitrogen dioxide | |
| Carbon monoxide | |
| Lead | |
| Benzene | A component of gasoline and some cleaning solvents |
| Perchloroethylene | |
| Methylene chloride | |
| Toluene | |
| Dioxin | |
| Mercury | |
| Chromium | |
| Petroleum and natural gas | |
| Wildfire smoke |
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What You'll Learn
Benzene and other toxic air pollutants
Benzene is a known cancer-causing substance that is a component of gasoline and some cleaning solvents. On average, gasoline sold in the United States contains 1.6% benzene. Eighty-five per cent of human exposure to benzene comes from gasoline. Exposure to benzene can lead to leukaemia and other blood disorders. Louisiana's benzene standard is more than twice as lenient as Texas's, which is over 30 times looser than that of Massachusetts.
Benzene emissions in Louisiana have decreased by 58% since 1987, according to the state's current toxic air pollutant control program, which covers over 200 pollutants and tracks toxic air emissions from over 250 industrial facilities. Despite this, Louisiana's industrial belt is experiencing a rise in toxic air pollution, with the burden falling disproportionately on communities of colour and poor communities, such as St. Gabriel, which already has some of the state's most toxic air.
Louisiana is approving the building of new chemical plants in areas that already have the state's worst air quality in a region known as "Cancer Alley". The state has been criticised for its lax regulatory regime, with the EPA noting that it only considers the effects of one chemical at a time, potentially undercounting the true effect on air quality.
Other toxic air pollutants in Louisiana include perchloroethylene, methylene chloride, toluene, dioxin, and metals such as mercury, chromium, and lead compounds. Louisiana's current toxic air pollutant control program also includes ammonia and hydrogen sulfide, with the latter's emissions 83% lower than in 1987.
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Petroleum and natural gas
Louisiana is rich in petroleum and natural gas reserves, with both resources found in abundance both onshore and offshore in state-owned waters. The state is also home to around 2% of the total US petroleum reserves and 5% of its natural gas reserves. In addition, huge petroleum and natural gas reserves are found off the coast of Louisiana in the Gulf of Mexico, which is the largest US petroleum-producing region.
The state's oil and gas producers waste tens of millions of dollars' worth of natural gas every year, which is detrimental to the environment, the state economy, and the state budget. This waste is largely due to methane venting and flaring, which is when natural gas is released into the atmosphere instead of being captured and sold. Methane is a potent greenhouse gas with 84 times the warming power of carbon dioxide over a 20-year period and is often accompanied by other local air pollutants.
Efforts to curb this waste include the implementation of standards by the LDNR to keep natural gas out of the atmosphere and in the pipeline. Several other states have already implemented strong rules to stop pollution and waste from routine flaring, and it is hoped that these efforts will create jobs, increase revenue, and strengthen climate security.
Despite these issues, Louisiana's air quality is slowly improving. In 2020, the capital city of Baton Rouge achieved the target figure for air quality set by the World Health Organization for 10 months out of the year. This was an improvement over the previous three years, with the annual average dropping from 9.9 µg/m³ in 2017 to 8.7 µg/m³ in 2020.
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Industrial plants and factories
Louisiana is a state in the Deep South and South Central regions of the United States, with an extensive coastline on the Gulf of Mexico. It is rich in petroleum and natural gas reserves, with around 2% of the US's petroleum reserves and 5% of its natural gas reserves. Louisiana is also home to a rapidly growing chemical industry.
The state's air quality has been worsening in recent years, with a crush of new industrial plants and factories increasing concentrations of toxic and cancer-causing chemicals in the air. Louisiana is approving the building of new chemical plants in areas that already have the state's worst air quality in a region known as "Cancer Alley". These industrial plants emit toxic air pollutants (TAPs) such as benzene, perchloroethylene, methylene chloride, toluene, dioxin, and metals such as mercury, chromium and lead compounds. Exposure to these pollutants is especially harmful to people living in close proximity to industrial facilities, in urban areas, and in low-income communities.
The Environmental Protection Agency (EPA) has been working with states to address air pollution by setting a process and timetable under the Data Requirements Rule (DRR) to implement the 2010 1-hour SO2 NAAQS. The EPA has also proposed amendments to the Clean Air Act that would require states to develop their own plans to reduce methane emissions from existing oil and gas sources, with the involvement of communities most impacted by air pollution.
Despite these efforts, Louisiana is among the least-improved states in terms of air quality. The number of facilities in the state that are required to report their toxic releases to the government has increased since the 1980s, while the national average has decreased. The state's capital, Baton Rouge, ranked 44th for the most polluted city when looking at ozone levels, and New Orleans tied for 93rd most polluted.
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Vehicle emissions
Carbon monoxide (CO) is a colorless, odorless, and toxic gas produced by the incomplete combustion of fossil fuels, such as gasoline and diesel. It is harmful to human health, as it can decrease the oxygen-carrying capacity of the blood, leading to headaches, dizziness, and even death in extreme cases. Nitrogen oxides (NOx) are another group of harmful gases emitted from vehicles, formed during the high-temperature combustion of fuel. These gases contribute to the formation of ground-level ozone and smog, which can irritate the respiratory system and exacerbate respiratory conditions such as asthma.
Particulate matter (PM) refers to a mixture of solid particles and liquid droplets found in the air. Vehicle emissions contribute to both coarse particulate matter (PM10) and fine particulate matter (PM2.5). PM10 can cause eye, nose, and throat irritation, while PM2.5 is even more concerning as it can penetrate deep into the lungs and enter the bloodstream, leading to heart and lung problems, including decreased lung function, asthma, irregular heartbeat, and an increased risk of heart attack.
Volatile organic compounds (VOCs) are also released from vehicle emissions, particularly from the evaporation of fuel and lubricants. These compounds can contribute to the formation of ground-level ozone and smog, exacerbating respiratory issues. Additionally, some VOCs are toxic and can have both short-term and long-term health effects, including eye, nose, and throat irritation, headaches, and damage to the central nervous system.
To address the issue of vehicle emissions and improve air quality in Louisiana, several measures can be implemented. Encouraging the use of public transportation, promoting electric or hybrid vehicles, and improving fuel efficiency standards can help reduce emissions from individual vehicles. Additionally, regular vehicle maintenance and emissions inspections are crucial to ensure that vehicles are operating efficiently and with minimal pollution.
Furthermore, implementing stricter emission standards and regulations for vehicles, particularly for heavy-duty trucks and buses, can significantly reduce pollution levels. This may include the development of low-emission zones or the promotion of active travel, such as walking and cycling, to reduce the overall number of vehicles on the road. By combining these strategies with a focus on enforcement and education, Louisiana can effectively reduce vehicle emissions and improve the air quality for its residents, protecting both their health and the environment.
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Wildfire smoke
Louisiana's air quality is primarily affected by particulate matter (PM2.5 and PM10) and ozone (O3). While some cities in the state, such as Shreveport, Bossier City, and Minden, have recorded their best-ever levels of ozone pollution, others, like the state capital, Baton Rouge, and New Orleans, have experienced an increase in unhealthy days with high ozone levels.
In addition to these existing air quality concerns, Louisiana is now facing a new threat in the form of wildfire smoke, which can be caused by wildfires in the state or in other parts of the country, such as the Canadian wildfires that affected Louisiana in June 2023.
The effects of wildfire smoke on air quality can vary depending on weather conditions, such as wind patterns and rainfall, which can disperse or clear the smoke. In the case of the Canadian wildfires, the smoke primarily affected Monroe and other areas in northern Louisiana, with similar incidents expected to occur again in the future. Experts attribute this to climate change, predicting that wildfires will become more intense and frequent in Louisiana, posing a dual threat when combined with other summertime hazards such as drought, hurricane risk, and extreme heat.
To address the immediate health risks associated with wildfire smoke, residents are advised to monitor air quality updates, stay indoors when possible, and wear masks when they need to be outdoors.
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Frequently asked questions
The main causes of air pollution in Louisiana are particulate matter (PM2.5 and PM10), ozone, sulfur dioxide, nitrogen dioxide, carbon monoxide, and lead. Louisiana is rich in petroleum and natural gas reserves, and the state has a growing chemical industry. The number of facilities in Louisiana that are required to report their toxic releases has increased since the 1980s.
Exposure to fine particle air pollution has been linked to heart and lung problems, including decreased lung function, asthma, irregular heartbeat, and heart attack. Sulfur dioxide (SO2) irritates the skin and mucous membranes, and exposure to it can affect healthy lung functioning and result in difficulty breathing, changes in the ability to breathe deeply, a tight feeling around the chest, or burning/inflammation of the eyes, nose, throat, and lungs.
The Environmental Protection Agency (EPA) is working with states to identify areas of concern and set standards for air quality. Louisiana is also implementing programs to monitor and improve air quality, such as the Ambient Air Monitoring Program by the Louisiana Department of Environmental Quality. Individuals can also contribute by reducing their fossil fuel consumption or taking part in local energy conservation programs.
