Helena Joyce
Salt Lake City has some of the worst air quality in the United States. In 2020, it was ranked as the seventh worst among large metro areas. The air quality is particularly poor in the winter, when temperature inversions trap polluted air, preventing its normal dispersal. This can cause a range of health issues for residents, from irritation to the nose, throat, and eyes to more serious problems like coughing, wheezing, chest pain, heart arrhythmia, and shortness of breath. Motor vehicles are the largest source of pollution emissions in the city, contributing 55% of all emissions. However, the air over the Salt Lake Valley has been improving in recent years, even as the city has become more crowded and seen an increase in cars. Real-time air pollution data and maps are available for those concerned about the air quality in Salt Lake City.
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What You'll Learn
- Salt Lake City's air quality is the nation's 7th-worst among large metro areas
- The city's air pollution is particularly harmful to children, the elderly, and those with heart and lung disease
- Motor vehicles are the largest source of pollution emissions in the city
- Temperature inversions in the winter trap polluted air, preventing its dispersal
- The air quality is generally acceptable, but sensitive groups may experience symptoms from long-term exposure
Salt Lake City's air quality is the nation's 7th-worst among large metro areas
Salt Lake City's air quality is notoriously poor, ranking as the nation's 7th-worst among large metro areas in 2020. This ranking is based on an analysis of 2018 air quality data, which showed that Salt Lake City had an average Air Quality Index (AQI) of 61. While this AQI falls within the moderate range, it is important to note that the city experienced 225 days in 2018 that were classified as "moderate or unhealthy," with two days reaching hazardous levels.
The primary sources of pollution in Salt Lake City are motor vehicles and homes and businesses, contributing 55% and 27% of the city's emissions, respectively. The city's geography, nestled among several mountain ranges, can also exacerbate pollution levels during temperature inversions, when ground-level air is trapped and unable to disperse, leading to a buildup of pollutants. These inversions are more common during the winter months, resulting in significantly higher PM2.5 concentrations compared to the summer.
The consequences of Salt Lake City's poor air quality are dire, with research indicating that air pollution reduces the average resident's life expectancy by 1.1 to 3.5 years. This loss of life is not limited to sensitive groups but impacts the general population as well. The pollution is particularly harmful to children, the elderly, and those with heart and lung diseases, causing various adverse health effects such as irritation to the nose, throat, and eyes, coughing, wheezing, chest pain, heart arrhythmia, and shortness of breath.
Despite these challenges, there is some progress in improving Salt Lake City's air quality. Recent years have seen a reduction in particle pollution and ozone levels, and the city had 138 days in 2018 when outdoor air was safe to breathe. Additionally, the air over the Salt Lake Valley has become cleaner, even as the area has become more urbanized. However, more efforts are needed to bring the city's air pollution levels within federal standards and protect the health and well-being of its residents.
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The city's air pollution is particularly harmful to children, the elderly, and those with heart and lung disease
Salt Lake City's air pollution is among the worst in the United States. The city's air quality is particularly harmful to children, the elderly, and those with heart and lung disease.
Children are more susceptible to the effects of air pollution because they breathe more rapidly and inhale more air relative to their size than adults. They also tend to spend more time outdoors, increasing their exposure to polluted air. Growing up breathing in high levels of air pollution can affect the development of children's lungs, putting them at greater risk of lung disease later in life. Long-term exposure to air pollution has been linked to asthma onset in children, lower respiratory tract infections, and neurological development issues.
Older adults are at an increased risk of harm from air pollution due to the aging process, which gradually reduces lung function. Exposure to air pollution can worsen this, causing stress on the lungs and heart. Older adults are also more likely to have pre-existing chronic illnesses, such as lung and heart disease, which may be exacerbated by breathing in unhealthy air.
People with heart and lung disease are particularly vulnerable to the effects of air pollution. The pollutants can cause cellular injury and inflammation, impacting the lungs, heart, and other organs. This can result in a worsening of symptoms, increased medication use, and more frequent hospital visits. Fine particulate matter in the air has been associated with increased rates of respiratory and cardiovascular diseases, stroke, cancer, and autoimmune disorders.
Salt Lake City's air pollution is not just harmful to these sensitive groups but also to the general population. The city's unhealthy levels of PM2.5 and ozone can cause a range of adverse health effects, including irritation to the nose, throat, and eyes, coughing, wheezing, chest pain, heart arrhythmia, and shortness of breath. The geography of the city, surrounded by mountains, can trap polluted air and further exacerbate the issue.
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Motor vehicles are the largest source of pollution emissions in the city
Salt Lake City has some of the worst air quality in the United States. While the air quality has improved in recent years, the city's air pollution still poses a significant health risk to its residents, particularly those from sensitive groups, including children, the elderly, and those with heart and lung diseases.
Motor vehicles are the largest source of pollution emissions in Salt Lake City, contributing to about 55% of the city's emissions. This is a trend common across most locations in the United States. The pollution from vehicles can be even more severe when they are not properly maintained or malfunction, emitting up to a hundred times more pollution than when operating correctly. The impact of vehicle emissions is further exacerbated by the city's geography, with surrounding mountains trapping polluted air in the Salt Lake Valley.
To address this issue, Salt Lake County has implemented a Vehicle Emissions Program. This program includes emission tests for vehicles registered in the county, with specific requirements based on the vehicle's model year and county of registration. For example, vehicles registered in Salt Lake County with model years less than six years old must undergo an emission test once every two years, with even- and odd-numbered model years tested in their respective even- and odd-numbered years. Vehicles that fail the emission test may qualify for the Vehicle Replacement Assistance Program (VRAP) to help owners replace their vehicles with more fuel-efficient and environmentally friendly options.
In addition to the efforts of the Vehicle Emissions Program, Utah law also requires licensed dealers to ensure that vehicles sold to residents of specific counties, including Salt Lake County, meet emissions testing requirements. This regulation extends to vehicles sold by licensed Utah dealers operating from non-emissions counties, who must provide customers with exemption affidavits and obtain emissions testing certificates within a specified timeframe. These measures aim to reduce the number of high-emitting vehicles on the road and improve the air quality in Salt Lake City.
While motor vehicles are the primary source of pollution emissions, homes and businesses contribute significantly as well, accounting for about 27% of the city's emissions. These emissions are attributed to space heating, water heating, and wood burning. Seasonal fluctuations, particularly during the winter months, also play a significant role in the city's air pollution levels. Temperature inversions trap polluted air, preventing its dispersal, which can result in significantly higher concentrations of pollutants during winter.
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Temperature inversions in the winter trap polluted air, preventing its dispersal
Salt Lake City has some of the worst air quality in the United States. While the air over the Salt Lake Valley has become cleaner in recent years, temperature inversions in the winter trap polluted air, preventing its dispersal and causing further deterioration in air quality.
Temperature inversions are a weather phenomenon where a layer of warm air settles above the valley, trapping a layer of cold air beneath it. In normal conditions, air is warmest near the ground and cools with gains in elevation. During a temperature inversion, the warm air layer prevents the cooler air from rising and dispersing, causing polluted ground-level air to accumulate. The geography of Salt Lake City, situated in a basin surrounded by mountains, exacerbates this effect by trapping cold air in the valley and shielding it from strong winds that could otherwise help clear out inversions.
The buildup of particle pollution during inversions worsens visibility and has severe health consequences for residents. Exposure to PM2.5, or particle pollutants measuring 2.5 microns in diameter or less, can aggravate respiratory and cardiac diseases. In Salt Lake City, PM2.5 concentrations can be more than five times higher during the winter months when temperature inversions are more common. Motor vehicles represent the largest source of pollution emissions in the city, contributing to 48% of PM2.5 pollution during a local inversion event. Other sources include wood burning, home heating, and emissions from larger industrial facilities.
The poor air quality caused by temperature inversions has led to public health emergencies in Salt Lake City. In 2013, the city suffered from a severe inversion that led a group of doctors to call for a public emergency. The unique topography, geography, and meteorology of the region contribute to the buildup of fine particulates during inversions, trapping pollution and preventing its dispersal.
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The air quality is generally acceptable, but sensitive groups may experience symptoms from long-term exposure
Salt Lake City's air quality is generally acceptable for most individuals. However, sensitive groups, including children, the elderly, and those with heart and lung diseases, may experience symptoms from long-term exposure.
The air quality in Salt Lake City has shown improvements in recent years, even as the city has become more crowded and urbanised. In 2019, the city's annual Air Quality Index (AQI) was 25, falling within the "'good'" range. However, seasonal fluctuations, particularly during the winter months, can cause increased pollution levels. Temperature inversions during winter trap polluted air, resulting in higher concentrations of PM2.5, which are harmful to sensitive groups.
Motor vehicles are the largest source of pollution emissions in Salt Lake City, contributing to 55% of the city's total emissions. Residential and commercial spaces are the second leading cause, at 27%, from sources such as heating and water heating. The geography of the city, surrounded by mountains, can also trap polluted air and prevent its dispersal, further exacerbating the issue.
Despite the overall acceptable air quality, sensitive groups may experience adverse health effects from long-term exposure. Symptoms can include irritation to the nose, throat, and eyes, coughing, wheezing, chest pain, heart arrhythmia, and shortness of breath. It is recommended that sensitive groups monitor real-time health advisories and take preventative actions to reduce their pollution exposure, especially during periods of high pollution.
While Salt Lake City's air quality has shown improvements, it is important to remain vigilant and continue implementing measures to reduce pollution levels, particularly during winter, to protect the health and well-being of sensitive individuals.
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Frequently asked questions
Salt Lake City's air quality is the nation's 7th worst among large metro areas. However, the air over the Salt Lake Valley has become cleaner in recent years.
Seasonal fluctuations play a significant role in Salt Lake City's air pollution. Winter months tend to be the most polluted due to temperature inversions trapping polluted air. Summer months experience high levels of ozone.
Salt Lake City's air pollution can cause adverse health effects, including irritation to the nose, throat, and eyes, coughing, wheezing, chest pain, heart arrhythmia, and shortness of breath. The pollution is particularly harmful to sensitive groups, including children, the elderly, and those with heart and lung diseases.
Salt Lake City's air quality is comparable to Las Vegas and Sacramento. California urban areas, such as Riverside, tend to have even worse air quality.
Yes, there are several online tools and plugins that provide real-time air pollution data for Salt Lake City, such as the Air Quality Index (AQI) and Plume Labs.
