Bronte Wells
San Francisco generally has good air quality, but there are still some areas of the city with unhealthy levels of air pollution. The air quality is influenced by factors such as the city's coastal location, topography, and sparse number of industrial production plants. However, transportation emissions from vehicles, planes, and ships significantly contribute to ambient air pollution levels. Wildfires in the Bay Area, which have been increasing in frequency, also cause drastic spikes in air pollution. To address these issues, San Francisco has implemented policies to minimize particulate matter emissions and promote the use of cleaner construction equipment, such as requiring new residential construction projects in areas with higher pollution levels to install enhanced ventilation systems.
| Characteristics | Values |
|---|---|
| Air Quality Index (AQI) | 38 (Good) |
| PM2.5 | 6µg/m³ |
| PM10 | 17µg/m³ |
| Temperature | 14°C |
| Annual PM2.5 concentration in 2019 | 7.1 μg/m3 |
| Annual PM2.5 concentration in 2018 | 12.6 μg/m3 |
| Annual PM2.5 concentration in 2020 | Unhealthy levels for more than 10 days |
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What You'll Learn
San Francisco's air quality is generally good
San Francisco generally enjoys good air quality for most of the year. The city's coastal location, natural topography, and sparse level of factories and industrial production plants all contribute to its good air quality rating.
However, there are still some areas of the city with higher levels of air pollution, particularly near freeways, ports, and industrial areas. The primary sources of air pollution in San Francisco are transportation emissions from vehicles, planes, and ships. The city has implemented policies to reduce these emissions, such as promoting the use of electric cars and trolleys, which do not generate tailpipe pollution.
Wildfires in the Bay Area, which have been increasing in frequency and size due to anthropogenic climate change, can also cause drastic spikes in air pollution, particularly during the summer and fall months. During these periods, air quality can quickly deteriorate to levels that pose significant health risks, including increased risks of lung cancer, chronic obstructive pulmonary diseases, and respiratory ailments such as asthma, bronchitis, and emphysema.
To address these challenges, San Francisco has demonstrated leadership in promoting clean air. The city has developed objectives and policies to guide its growth and protect residents' health, such as requiring new residential construction projects in areas with higher pollution levels to install enhanced ventilation systems. Additionally, the city has adopted an all-electric new construction ordinance, prohibiting the installation of gas piping systems and mandating the use of electric systems for space conditioning, water heating, cooking, and clothes drying. These efforts reflect San Francisco's commitment to minimizing air pollution and its potential impacts on public health and economic growth.
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Wildfires and industrial production contribute to poor air quality
San Francisco has seen improving air quality over the last 30 years, with cleaner transportation options, tighter regulatory controls on industry, and stringent local and state regulations on emissions. However, wildfires and industrial production continue to contribute to poor air quality in the city.
Wildfires in the Bay Area have increased in size and frequency over the last two decades, coinciding with rising temperatures and changing weather patterns due to anthropogenic climate change. Wildfires cause drastic spikes in air pollution, and in 2017, parts of the San Francisco Bay Area suffered from hazardous air quality due to wildfires in Northern California, with pollution levels several grades above unhealthy. Wildfires in 2018 and 2020 also led to an increase in PM2.5 levels, with 2020 being a record-breaking year for burned acreage in California. The smoke and fumes from these fires contain harmful pollutants, including particulate matter, which can have negative health effects when inhaled.
In addition to wildfires, industrial production also contributes to poor air quality in San Francisco. While the city has a sparse level of factories and industrial production plants, there are still some industrial businesses operating in the area. The Hunters Point and Potrero Hill power plants, for example, were only closed in 2006 and 2010, respectively. Construction sites have also been identified as a 'silent' pollution source, releasing microplastics, finely ground dust, and metals into the atmosphere.
The air pollution from these sources can have negative health effects on residents, especially sensitive groups such as the elderly, children, and people with asthma or other respiratory diseases. To protect themselves during periods of poor air quality, residents are advised to stay indoors, avoid outdoor exertion, and wear N95 masks when outdoors. UCSF and other organizations in San Francisco actively monitor air quality and take measures to protect their employees, learners, and patients during periods of poor air quality.
Overall, while San Francisco has made significant improvements in air quality over the years, wildfires and industrial production continue to be contributing factors to poor air quality in the city, highlighting the need for continued efforts to minimize air pollution and its impact on human health.
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The city is taking steps to reduce air pollution
San Francisco generally has good air quality, but there are still areas with unhealthy levels of air pollution. The city's air pollution primarily comes from transportation emissions, including cars, motorbikes, trucks, planes, and ships. Wildfires in the Bay Area, which are becoming more common, also cause drastic spikes in air pollution. To reduce air pollution, the city of San Francisco has implemented various measures:
The San Francisco Planning and Public Health departments, along with the Bay Area Air Quality Management District (BAAQMD), conducted a Citywide Air Quality Health Risk Assessment in 2020. This assessment helped identify areas with higher levels of air pollution, including emissions from stationary sources like wastewater treatment plants, mobile sources like cars and trucks, and maritime sources such as ferries and shipping vessels. The creation of the Air Pollutant Exposure Zone (APEZ) map, based on this assessment, allows for the identification of zones with higher pollution levels and guides the enforcement of relevant policies.
To minimize particulate matter emissions from road and construction sites, the city has implemented policies recommended by the BAAQMD. These include spraying sites with water or other dust inhibitors during demolition, grading, and new construction. The San Francisco Building Code also mandates a reduction in airborne dust from building materials during demolition. Additionally, the city has adopted an All-Electric Construction Ordinance, prohibiting the installation of gas piping systems in new constructions and requiring all space-conditioning, water heating, cooking, and clothes drying systems to be all-electric.
San Francisco has also addressed the issue of vehicle emissions by promoting the use of electric cars and trolleys, which do not generate tailpipe pollution. The city has recognized the leadership of San Francisco in promoting clean air, given its population density and transportation system. The city continues to work on reducing pollution from automobiles and trucks through various initiatives.
Furthermore, the city has focused on public awareness and education to protect children and the elderly from exposure to air pollutants. The city has also addressed indoor air quality by recognizing the impact of common household products like aerosol sprays, paints, and solvents, which can cause indoor air pollution.
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Transport is a major source of air pollution
San Francisco's air quality has improved over the last 30 years. This can be attributed to the city's coastal location, natural topography, and sparse level of factories and other industrial production plants around the city. However, transport is a major source of air pollution in the city.
The primary sources of transport-related air pollution in San Francisco are vehicles such as cars, motorbikes, and trucks, as well as planes and ships. The large number of commuters who drive into the city also contributes to the high levels of transport-related air pollution. In recent years, roughly 20-25% of calendar days averaged "moderate" or worse air quality within San Francisco.
To combat this issue, the city has implemented various measures. The San Francisco Transportation Authority is working to reduce transportation-related greenhouse gas emissions by promoting sustainable modes of transportation such as public transit, biking, walking, and carpooling. The city has set a goal of achieving 80% of trips by these sustainable modes by 2030. The Transportation Fund for Clean Air program funds electric vehicle chargers and bike racks throughout the city, and pricing and incentive tools are being used to reduce congestion and fund transit.
Despite these efforts, there is still a significant funding gap for San Francisco's transportation systems from 2019 to 2045. The California Air Resources Board reported in 2018 that California is failing to meet its climate goals due to increasing emissions from vehicle travel. To achieve further reductions in transport-related air pollution, a shift from fossil fuel dependence to cleaner, more sustainable energy is needed. This includes reducing the number of automobiles on roadways and vehicle miles travelled, as well as transitioning to electric cars and trolleys that do not generate tailpipe pollution.
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Poor air quality can negatively impact health
Poor air quality can be a serious threat to the economic growth of San Francisco and the region. The city's air pollution primarily comes from transportation emissions, namely vehicles such as cars, motorbikes, trucks, planes, and ships. Wildfires in the Bay Area, which are becoming increasingly common, also contribute to drastic spikes in air pollution. While the air quality in San Francisco is currently rated as good, the negative health impacts of air pollution are well-documented.
Air pollution is a major threat to global health and prosperity, causing more than 6.5 million deaths each year worldwide. It is a mix of hazardous substances from both human-made and natural sources, including vehicle emissions, fuel oils, natural gas, by-products of manufacturing, and power generation. When inhaled, air pollutants can enter the bloodstream and contribute to coughing, itchy eyes, and cause or worsen many breathing and lung diseases, leading to hospitalizations, cancer, or even premature death. Fine particulate matter, such as that found in vehicle exhaust, smoke, road dust, and industrial emissions, is of particular concern as it can penetrate deep into the lungs and travel to other organs, causing systemic damage.
Short-term exposure to higher levels of outdoor air pollution is associated with reduced lung function, asthma, cardiac problems, and emergency department visits. Long-term exposure to air pollutants has been linked to an increased risk of developing chronic diseases, including lung cancer, chronic obstructive pulmonary disease (COPD), chronic bronchitis, and cardiovascular disease. Certain vulnerable populations, such as children, the elderly, and people with pre-existing respiratory conditions, are at an even greater risk of adverse health effects from air pollution.
In addition to respiratory and cardiovascular health, air pollution has also been linked to adverse birth outcomes, such as low birth weight, pre-term birth, and small for gestational age births. Research has also suggested a potential link between air pollution and neurological development in children, with an increased risk of developing neurological disorders such as Alzheimer's disease, Parkinson's disease, and other dementias. Furthermore, air pollution can impact economic growth, limit the growth of industries, and make cities less desirable places to live and work.
To mitigate the negative health impacts of air pollution, it is crucial to minimize both air pollution emissions and human exposure to existing pollution. This can be achieved through various measures, such as reducing particulate matter emissions during construction and demolition, transitioning to electric vehicles, and implementing educational programs to raise awareness and protect vulnerable populations from exposure to air pollutants.
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Frequently asked questions
San Francisco generally has good air quality, but there are areas with unhealthy levels of air pollution.
The main sources of pollution in San Francisco are transportation emissions, industrial production plants, and wildfires.
Air quality in San Francisco varies by location, weather, and land use. Areas close to freeways, ports, or industrial activities generally have more air pollution.
The City and County of San Francisco have implemented policies to reduce air pollution and exposure, such as requiring new residential construction projects in areas with high air pollution to install enhanced ventilation.
