Instruct: Given a question, retrieve documents that answer the question.
Query: What is the air quality in Los Angeles?
According to the American Lung Association's recent "State of the Air 2017" report, California is a leader in air pollution among other states, with the highest ozone levels. The top three cities in the country with the highest recorded levels of ozone (smog) levels were Los Angeles-Long Beach, Bakersfield, and Fresno-Madera. Salinas, California is the only city of California that reports no days of unhealthy air quality. While the air quality in California is significantly better in northern California, more than ninety percent of Californians live in counties with unhealthy air.
In 1989, the City of Santa Monica officially rededicated the original Muscle Beach and today it serves gymnasts, acrobats and youth with an extensive gymnastics training area. Meanwhile, the City of Los Angeles Recreation and Parks Department has continued the primary barbell, weightlifting and bodybuilding aspects, and events of the original Muscle Beach fame at the Venice weight pen. In 1987, the City of Los Angeles officially dedicated "Muscle Beach Venice" with the added word of "Venice" in the title to distinguish it from the original "Muscle Beach" in Santa Monica.
The Toxic 100 Air polluters index from the University of Massachusetts lists Precision Castparts as the number one air polluter in the U.S. in the August 2013 edition, which the company called a flawed study.
In Northern California, Stockton, Modesto, and Oakland have significant Cambodian populations, while San Jose, Santa Rosa and Sacramento have sizable communities as well. Outside of California, the Pacific Northwest is home to another large Cambodian settlement, specifically in cities such as Tacoma, where Cambodians enumerate at thousands, or 1.6% of the population. There are also growing Cambodian American communities in Las Vegas, Nevada; Phoenix, Arizona; Salt Lake City, Utah; and Denver, Colorado, as the Asian American population continues to rapidly increase in Nevada, Arizona, Utah, and Colorado.
As part of the consent decree signed by Caltrans in 1972 to allow construction of the fiercely opposed Century Freeway, provisions were made for a transit corridor in the freeway's median. Construction began in 1987 on the line as a light rail line, with a route mostly following I-105 but a short section in the South Bay following the Harbor Subdivision. This western alignment was originally planned and partially constructed to connect with LAX, but the airport was planning a major renovation during the line's construction. Los Angeles World Airports wanted the connection to LAX to be integrated with this construction, but there were concerns from the Federal Aviation Administration that the overhead lines of the rail line would interfere with the landing paths of airplanes.
The Los Angeles Rams are a professional American football team based in Los Angeles, California, which competes in the National Football League's NFC West division. The franchise has won three NFL championships, and is the only one to win championships representing three different cities (Cleveland in 1945, Los Angeles in 1951, and St. Louis in 1999). The Rams play their home games at the Los Angeles Memorial Coliseum.
The City of Los Angeles Park Rangers provides public assistance and emergency services in Los Angeles City parks, including first aid, park policing, search and rescue, and are trained wildland firefighters. They have various responsibilities in public parks and provide not only emergency and public safety services but also informational services at several parks. Park rangers receive law enforcement training and have certified peace officer status in California. All Park Rangers are required to obtain a Basic P.O.S.T certificate to remain employed. Park Rangers attend the Los Angeles Police Departments academy. The Ranger Division is a participating agency in P.O.S.T which sets the standards of training for peace officers. In 1996 due to spikes in violent crime in city parks patrolled by the Rangers, the union representing the rangers requested that the Rangers be trained to carry semi-automatic handguns similar to the Police but the request was eventually denied due to opposition from the LAPD and the Parks Department. In 2000 the Parks and Recreation Department and the LAPD attempted to change the duties of the Park rangers by signing an agreement that would make the LAPD responsible for all arrests made in city parks and that Rangers would only be allowed to make arrests if someone's life was in danger. After strong opposition from the Park rangers, the city council eventually rejected the proposed agreement and Park rangers continued with their original peace officer status.
The extremely high temperatures of lava flows (1200 °C; 2200 °F) cause sea water to decompose into hydrogen and oxygen. The hydrogen combines with chloride ions dissolved in sea water, forming hydrogen chloride gas (hydrochloric acid). The rapidly rising plume of gas also carries with it fine particles of volcanic glass. The hydrochloric acid and other contaminants can precipitate out rapidly and the plume may become relatively safe a few hundred meters away, however, laze plumes should be shown a degree of respect as they can and have killed people who come in contact with them. The USGS has reported that, in 2000, two people were killed by exposure to laze clouds.
Silicon Valley is a region in the southern San Francisco Bay Area of Northern California that serves as a global center for high technology, innovation and social media. It corresponds roughly to the geographical area of Santa Clara Valley. San Jose is the Valley's largest city, the third largest in California, and the tenth largest in the United States. Other major Silicon Valley cities include Palo Alto, Menlo Park, Cupertino, Santa Clara, Mountain View, and Sunnyvale. The San Jose Metropolitan Area has the third highest GDP per capita in the world (after Zurich, Switzerland and Oslo, Norway), according to the Brookings Institution.
New York City is the most populous city in the United States, with an estimated record high of 8,622,698 residents , incorporating more immigration into the city than outmigration since the 2010 United States Census. More than twice as many people live in New York City as in the second-most populous U.S. city (Los Angeles), and within a smaller area. New York City gained more residents between April 2010 and July 2014 (316,000) than any other U.S. city. New York City's population is about 43% of New York State's population and about 36% of the population of the New York metropolitan area.
People of lower socioeconomic status are found to be more vulnerable to air pollutant, PM 2.5, due to their location. PM 2.5 is an air pollutant, arising from the blend of power plants, refineries, and diesel engines, among other sources, and this particle penetrates the lungs. Communities of low socioeconomic statuses are frequently concentrated in areas near highways, busy roads, and refineries. Therefore, limiting one's exposure to air pollution in an impoverished environment is nearly impossible. Communities of low socioeconomic status face an unequal access to environmental health services and resources.
The Los Angeles Memorial Coliseum is an American outdoor sports stadium located in the Exposition Park neighborhood of Los Angeles, California, United States. The stadium serves as the home to the University of Southern California (USC) Trojans football team of the Pac-12 Conference. It is also the temporary home of the Los Angeles Rams of the National Football League (NFL). The Coliseum was home to the Rams from 1946 to 1979, when they moved to Anaheim Stadium in Anaheim. The Coliseum is serving as their home stadium again until the completion of Los Angeles Stadium at Hollywood Park in Inglewood. The facility had a permanent seating capacity of 93,607 for USC football and Rams games, making it the largest football stadium in the Pac-12 Conference and the NFL. USC, which operates and manages the Coliseum, began a major renovation of the stadium in early 2018. During the renovation project the seating capacity will be 78,467. Once USC completes the renovation in 2019, the seating capacity will be 77,500.
No single ethnic group forms a majority of California's population, making the state a minority-majority state. Hispanics (of any race) are the largest single ethnic group in the state. Spanish is the state's second most widely spoken language. Areas with especially large Spanish speaking populations include the Los Angeles metropolitan area, the California-Mexico border counties of San Diego and Imperial, and the San Joaquin Valley. Nearly 43% of Californian residents speak a language other than English at home, a proportion far higher than any other state.
By 1964, the department had developed an AQI called the SCS Air Pollution Index (SCS API), combining measurements of sulfur dioxide (SO), carbon monoxide (CO), and coefficient of haze (also called smoke shade) into a single number. The city laboratory recorded the presence of those three pollutants measured in amount (by concentration in the air) and duration. SO and CO were measured by parts-per-million, or ppm, and smoke shade was measured in mppcf (millions of particles per cubic foot); the department continuously monitored these pollutant levels and recorded their hourly averages. The data for those three pollutants were combined into a single number using a weighted formula developed by department co-founder Moe Mordecai Braverman. The SCS API formula was:
The largest urban area in the United States is the New York metropolitan area. The population of New York City, the core of the metropolitan area, exceeds 8.5 million people, its metropolitan statistical area has a population that is over 20 million, and its combined statistical area population is over 23 million. The next six largest urban areas in the U.S. are Los Angeles, Chicago, Miami, Philadelphia, San Francisco, and Houston. About 82 percent of the population of the United States lives within the boundaries of an urbanized area as of December, 2010. Combined, these areas occupy about 2 percent of the land area of the United States. Many Americans live in agglomerations of cities, suburbs, and towns that are adjacent to a metropolitan area's largest city.
Beverly Hills and the Los Angeles communities of Bel-Air and Brentwood were the destinations of many Iranian immigrants, who were the first immigrant groups to settle in these communities. In addition to those places Iranians also live in Santa Monica, West Los Angeles, and Westwood. As of 2007 there were about 8,000 Iranians in Beverly Hills, making up about 20% of the city's population, and as of 1990 the majority of Iranians in Beverly Hills were Jewish. By that year many Iranian restaurants and businesses were established in a portion of Westwood Boulevard south of Wilshire Boulevard. In 1990 Ivan Light, a sociologist for the University of California, Los Angeles, stated that the Westwood Boulevard area was the only "central location" for Iranians in Los Angeles and that they were otherwise dispersed throughout the area.
On November 4, 2014, Supervisor Kuehl was elected to the Los Angeles County Board of Supervisors. She assumed office on December 1, 2014, thus becoming the first openly LGBTQ person to ever serve on the Board. As the representative of Los Angeles County's 3rd Supervisorial District, she serves the interests of nearly two million residents, and is responsible for managing 431 square miles of land stretching from the ocean to Los Feliz, and from Venice up to San Fernando. In 2018, she is serving as Chair of the Board of Supervisors.
Although almonds are not native to California, a hot, dry Mediterranean climate and developed water infrastructure create ideal conditions for commercial cultivation of the crop. The state produces 80% of the world’s almonds and 100% of the United States’ commercial supply.
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
The Blue Silicon Valley is located in the Monterey Bay of California, USA and is part of one of the leading and largest sustainable, marine protected area, research and development regions in the world called the Monterey Bay National Marine Sanctuary (MBNMS), which encompasses a shoreline length of 276 miles and more than 6,000 square miles of ocean. Monterey Bay itself is located 30 miles southwest of Silicon Valley and as part of the MBNMS was designated by the National Oceanic and Atmospheric Administration (NOAA) in 1992, bringing federal protection to the marine area in Northern California stretching from Marin County to Cambria, California. The sanctuary was originally established for the purposes of resource protection, research and development, education and public use and is now the most researched body of water in the world.
However, according to Amnesty International, Human Rights Watch, the Center for Public Policy Analysis, the United League for Democracy in Laos, the Lao Human Rights Council, the Lao Veterans of America Institute, and many human rights organizations, non-governmental organizations, and policy experts, the reality in Laos is quite different, and the Marxist government generally does not abide by its own Constitution. The Lao government in Vientiane has been frequently condemned by the US Congress, United Nations Committee on Racial Discrimination, European Parliament and human rights advocates, especially in light of the imprisonment of pro-democracy Lao student leaders in October 1999, the persecution of Hmong refugees and asylum seekers and the recent abduction and disappearance of civil society leader Sombath Somphone.
Bel Air is situated about west of Downtown Los Angeles and includes some of the foothills of the Santa Monica Mountains. It lies across Sunset Boulevard from the northern edge of the main campus of the University of California, Los Angeles. At the heart of the community sits the Bel-Air Country Club and the Hotel Bel-Air.
The smog season lasts from approximately May to October. While other large cities rely on rain to clear smog, Los Angeles gets only of rain each year: pollution accumulates over many consecutive days. Issues of air quality in Los Angeles and other major cities led to the passage of early national environmental legislation, including the Clean Air Act. When the act was passed, California was unable to create a State Implementation Plan that would enable it to meet the new air quality standards, largely because of the level of pollution in Los Angeles generated by older vehicles. More recently, the state of California has led the nation in working to limit pollution by mandating low-emission vehicles. Smog is expected to continue to drop in the coming years because of aggressive steps to reduce it, which include electric and hybrid cars, improvements in mass transit, and other measures.
Air pollution in Los Angeles has caused widespread concerns. In 2011, the Public Policy Institute of California (PPIC) Survey on Californians and the Environment showed that 45% of citizens in Los Angeles consider air pollution to be a “big problem”, and 47% believe that the air quality of Los Angeles is worse than it was 10 years ago. In 2013, the Los Angeles-Long Beach-Riverside area ranked the 1st most ozone-polluted city, the 4th most polluted city by annual particle pollution, and the 4th most polluted city by 24-hour particle pollution.
Los Angeles was one of the best known cities suffering from transportation smog for much of the 20th century, so much so that it was sometimes said that "Los Angeles" was a synonym for "smog." In 1970, when the Clean Air Act was passed, Los Angeles was the most polluted basin in the country, and California was unable to create a State Implementation Plan that would enable it to meet the new air quality standards. However, ensuing strict regulations by state and federal government agencies overseeing this problem (such as the California Air Resources Board and the United States Environmental Protection Agency), including tight restrictions on allowed emissions levels for all new cars sold in California and mandatory regular emission tests of older vehicles, resulted in significant improvements in air quality. For example, air concentrations of volatile organic compounds declined by a factor of 50 between 1962 and 2012. Concentrations of air pollutants such as nitrous oxides and ozone declined by 70% to 80% over the same period of time.In the late 1990s, massive immigration to Ulaanbaatar from the countryside began. An estimated 150,000 households, mainly living in traditional Mongolian gers on the outskirts of Ulaanbaatar, burn wood and coal (some poor families burn even car tires and trash) to heat themselves during the harsh winter, which lasts from October to April, since these outskirts are not connected to the city's central heating system. A temporary solution to decrease smog was proposed in the form of stoves with improved efficiency, although with no visible results. 
Coal-fired ger stoves release high levels of ash and other particulate matter (PM). When inhaled, these particles can settle in the lungs and respiratory tract and cause health problems. At two to 10 times above Mongolian and international air quality standards, Ulaanbaatar's PM rates are among the worst in the world, according to a December 2009 World Bank report. The Asian Development Bank (ADB) estimates that health costs related to this air pollution account for as much as 4 percent of Mongolia's GDP.