Air pollution

air qualityair pollutantemissions
Smoke and carbon monoxide from wildfires. During periods of actives wildfires, smoke from uncontrolled biomass combustion can make up almost 75% of all air pollution by concentration. Vegetation, in some regions, emits environmentally significant amounts of Volatile organic compounds (VOCs) on warmer days. These VOCs react with primary anthropogenic pollutants—specifically, NO x, SO 2, and anthropogenic organic carbon compounds — to produce a seasonal haze of secondary pollutants. Black gum, poplar, oak and willow are some examples of vegetation that can produce abundant VOCs.

United States Environmental Protection Agency

Environmental Protection AgencyEPAU.S. Environmental Protection Agency
On April 28, 2017, multiple climate change subdomains at began redirecting to a notice stating "this page is being updated." The EPA issued a statement announcing the overhaul of its website to "reflect the agency's new direction under President Donald Trump and Administrator Scott Pruitt." The removed EPA climate change domains included extensive information on the EPA's work to mitigate climate change, as well as details of data collection efforts and indicators for climate change.


CAState of CaliforniaCalifornia, USA
Shasta to Los Angeles. Time-Lapse Tilt-Shift Portrait of California by Ryan and Sheri Killackey. Sixty Years in Southern California 1853–1913... Early City Views (los Angeles). Sixty Years in Southern California 1853–1913... Early City Views (los Angeles).


photochemical smogair quality remediation effortssummer smog
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.

California Environmental Protection Agency

CalEPACalifornia EPACal/EPA
California Air Resources Board (ARB). Department of Pesticide Regulation (DPR). California Department of Resources Recycling and Recovery (CalRecycle). Department of Toxic Substances Control (DTSC). Office of Environmental Health Hazard Assessment (OEHHA). State Water Resources Control Board (SWRCB). California Department of Conservation. Climate change in California. Environmentalism. Kyoto Protocol. Pollution in California. United States Environmental Protection Agency.

Mediterranean climate

warm-summer Mediterranean climateMediterraneanCsb
For instance, in the case of winters, Barcelona and Los Angeles experience mild temperatures in the winter, with frost and snowfall almost unknown, whereas Tashkent has colder winters with annual frosts and snowfall. Or to consider summer, Athens experiences rather high temperatures in that season (48 C has been measured in nearby Eleusis). In contrast, San Francisco has cool summers with daily highs around 21 C due to the continuous upwelling of cold subsurface waters along the coast.

San Diego

San Diego, CaliforniaSan Diego, CACity of San Diego
In 2017, they moved to Los Angeles and became the Los Angeles Chargers. In two separate stints, the National Basketball Association had a franchise in San Diego, the San Diego Rockets from 1967 to 1971 and the San Diego Clippers from 1978 to 1984. The franchises moved to Houston and Los Angeles respectively. From 1972 to 1975, San Diego was home to an American Basketball Association team. First named the Conquistadors ( "The Q's") the name was changed to the San Diego Sails for the 1975–76 season, but the team folded before completing that campaign. In 2017 the San Diego 1904 FC club was organized as a proposed American professional Division II soccer team.

Clean Air Act (United States)

Clean Air ActClean Air Act Amendments of 1990Clean Air Act of 1970
Alleged violations by Hyundai and Kia which resulted in a total $100 million in civil penalties paid to the United States and to the California Air Resources Board. Clean Air Act (disambiguation). Air quality law. United States environmental law. Alan Carlin, controversy over the [[Clean Air Act (United States)#Proposed endangerment finding related to the Clean Air Act 202(a)|EPA carbon dioxide endangerment finding]]. Commission on Risk Assessment and Risk Management. Emission standard. Emissions trading. Environmental policy of the United States. Startups, shutdowns, and malfunctions. The Center for Clean Air Policy (in the US). EPA Enforcement and Compliance History Online.

Nitrogen oxide

nitrogen oxidesoxides of nitrogenNO x
Nitrogen oxide may refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds:

San Diego County, California

San Diego CountySan DiegoSan Diego metropolitan area
The Los Angeles Times is also delivered in portions of the county. Many of the area's cities, towns and neighborhoods have their own local newspapers; the Union Tribune bought eight local weeklies in 2013 and is continuing to publish them as independent local newspapers. The San Diego Daily Transcript reports business and legal news. Privately published papers like the Military Press Newspaper and the Navy Dispatch serve the military community both on and off base.

San Joaquin Valley

San JoaquinSan Joaquin Valley (North)San Joaquin Valley, California
As areas such as Chino and Corona have become absorbed into the suburban sprawl of Los Angeles, many dairy farmers have cashed out and moved their herds to Kings, Tulare, and Kern counties. Between 1990 and 2004, 28,092 hectares (70,231 acres) of agricultural land was lost to urban development in the San Joaquin Valley.

California Gold Rush

Gold RushForty-niners49er
The first discovery of gold, at Rancho San Francisco in the mountains north of present-day Los Angeles, had been in 1842, six years before Marshall's discovery, while California was still part of Mexico. However, these first deposits, and later discoveries in Southern California mountains, attracted little notice and were of limited consequence economically. By 1850, most of the easily accessible gold had been collected, and attention turned to extracting gold from more difficult locations. Faced with gold increasingly difficult to retrieve, Americans began to drive out foreigners to get at the most accessible gold that remained.

Urban area

Urbanurban agglomerationagglomeration
The next six largest urban areas in the U.S. are Los Angeles, Chicago, Miami, Philadelphia, San Francisco, Houston, and Atlanta. 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. The concept of Urbanized Areas as defined by the U.S.

Central Valley (California)

Central ValleyCalifornia Central ValleyCentral Valley of California
Many people from Los Angeles and the San Francisco Bay Area relocated to growing San Joaquin Valley suburbs in search of more affordable housing while retaining employment outside the Valley. This has led to traffic congestion between their Valley residences and their Bay Area employment with accompanying air pollution. Air pollution became a principal environmental and health concern in the 1960s, and resulted in the establishment of the California Air Resources Board in 1967. Highways Interstate 5 and CA 99 run, roughly parallel, north-south through the valley, meeting at only its south end. The Interstate 80 Business Loop connects the two highways at their closest point.

Climate change in California

California Center for Sustainable Energy2011–17 California droughtCAB 1493
In 2017, a study projected that the single largest threat to Los Angeles County hospitals related to climate change is the direct impact of the expected increase in wildfires. In Los Angeles County, 34% of hospitals are located within one mile of fire hazard severity zones. Additionally, one of these hospitals was also deemed in danger of coastal flooding due to the effects of climate change as concluded by the study. This latter issue was also included and focused on, as the study likewise concluded that this would become a greater hazard as sea levels rise due to increase annual temperatures.

United States

Hollywood, a northern district of Los Angeles, California, is one of the leaders in motion picture production. The world's first commercial motion picture exhibition was given in New York City in 1894, using Thomas Edison's Kinetoscope. The next year saw the first commercial screening of a projected film, also in New York, and the United States was in the forefront of sound film's development in the following decades. Since the early 20th century, the U.S. film industry has largely been based in and around Hollywood, although in the 21st century an increasing number of films are not made there, and film companies have been subject to the forces of globalization. Director D. W.

Atchison, Topeka and Santa Fe Railway

Santa Fe RailroadAtchison, Topeka and Santa Fe RailroadSanta Fe
Fast Mail Express: San Francisco, California (via Los Angeles) — Chicago, Illinois. Golden Gate: Oakland, California — Bakersfield, California with coordinated connecting bus service to Los Angeles and San Francisco. Grand Canyon Limited: Chicago, Illinois — Los Angeles, California. The Hopi: Los Angeles, California — Chicago, Illinois. Kansas Cityan: Chicago, Illinois — Kansas City, Missouri (this was the westbound version of the Chicagoan passenger train). Kansas City Chief: Kansas City, Missouri — Chicago, Illinois. Los Angeles Express: Chicago, Illinois — Los Angeles, California (this was the westbound version of the Atlantic Express).

San Pedro, Los Angeles

San Pedro, CaliforniaSan PedroSan Pedro, Los Angeles, California
San Pedro is a community within the city of Los Angeles, California. Formerly a separate city, it consolidated with Los Angeles in 1909. The Port of Los Angeles, a major international seaport, is partially located within San Pedro. The district has grown from being dominated by the fishing industry to become primarily a working class community within the city of Los Angeles. San Pedro is mainly pronounced as “San Pee-dro” by English-speaking locals. San Pedro is located at 33.73333°N, -118.3°W (33.74, −118.29).

Los Angeles Aqueduct

Owens Valley aqueductaqueductLos Angeles Aqueduct system
The Los Angeles Aqueduct system, comprising the Los Angeles Aqueduct (Owens Valley aqueduct) and the Second Los Angeles Aqueduct, is a water conveyance system, built and operated by the Los Angeles Department of Water and Power. The Owens Valley aqueduct was designed and built by the city's water department, at the time named The Bureau of Los Angeles Aqueduct, under the supervision of the department's Chief Engineer William Mulholland. The system delivers water from the Owens River in the Eastern Sierra Nevada Mountains to Los Angeles, California.

North America

NorthNorth AmericanNA
Parts of western Mexico, including Baja California, and of California, including the cities of San Diego, Los Angeles, and Santa Cruz, lie on the eastern edge of the Pacific Plate, with the two plates meeting along the San Andreas fault. The southernmost portion of the continent and much of the West Indies lie on the Caribbean Plate, whereas the Juan de Fuca and Cocos plates border the North American Plate on its western frontier.


eucalypteucalyptus treeeucalypts
Wildfire is a feature of the Australian landscape and many eucalypt species are adapted to fire, and resprout after fire or have seeds which survive fire. A few species are native to islands north of Australia and a smaller number are only found outside the continent. Eucalypts have been grown in plantations in many other countries because they are fast growing and have valuable timber, or can be used for pulpwood, for honey production or essential oils. In some countries, however, they have been removed because they are highly flammable. Eucalypts vary in size and habit from shrubs to tall trees.

Pacific Electric

Pacific Electric RailwayRed CarPacific Electric Railroad
Organized around the city centers of Los Angeles and San Bernardino, it connected cities in Los Angeles County, Orange County, San Bernardino County and Riverside County. The system shared dual gauge track with the narrow gauge Los Angeles Railway, "Yellow Car," or "LARy" system on Main Street in downtown Los Angeles (directly in front of the 6th and Main terminal), on 4th Street, and along Hawthorne Boulevard south of downtown Los Angeles toward the cities of Hawthorne, Gardena, and Torrance. The system had four districts: Electric trolleys first appeared in Los Angeles in 1887.

Global warming

climate changeglobal climate changeanthropogenic climate change
In the 2000s, the term climate change increased in popularity. In technical sources, the term climate change is also used to refer to past and future climate changes that persist for and extended period of time, and includes regional changes as well as global change. People who regard climate change as catastrophic, irreversible, or rapid might label climate change as a climate crisis or a climate emergency. One newspaper, The Guardian, has embraced this terminology (as well as global heating) in their editorial guidelines.

Port of Los Angeles

Los Angeles HarborLos AngelesHarbor area
Todd Pacific Shipyards, Los Angeles Division, a Port of Los Angeles shipyard from 1917 to 1989. United States container ports. Panoramic photographs of Los Angeles Harbor, taken in 1908 and 1926, The Bancroft Library.


Hollywood, CaliforniaHollywood, CAHollywood, Los Angeles, California
The parade goes down Hollywood Boulevard and is broadcast in the Los Angeles area on KTLA, and around the United States on Tribune-owned stations and the WGN superstation. The Hollywood Half Marathon takes place in April (since 2012) of each year, to raise funds and awareness for local youth homeless shelters. The event includes a Half Marathon, 10K, 5K, and Kids Fun Run along Hollywood Blvd. Community newspapers in Hollywood, California. List of Hollywood-inspired nicknames. History of film. List of Hollywood novels. List of films set in Los Angeles. List of Los Angeles Historic-Cultural Monuments in Hollywood. List of television shows set in Los Angeles. North Hollywood, Los Angeles.