Why do pollution and smog often become trapped in los angeles and other similar urban areas?

Smog is usually defined as a fog that is intermixed with smoke particles and other particulate matter present in the atmosphere. This smog, along with the pollution is often trapped in the city of Los Angeles and similar urban areas, because the city is located in a basin near the coastal area, and is surrounded by the hills on all sides. There occurs a large emission of carbon due to the use of vehicles. There also occurs relatively less rainfall due to which these particles are trapped in the atmosphere.

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.