The United States is the world's `most polluted` and California the worst

<p style=";text-align:left;direction:ltr">ArabiaWeather.com - The American Lung Association, which specializes in lung diseases, stated that nearly 148 million people in the United States, or half of its population, live in dangerous levels of <strong>air pollution.</strong></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> It was concluded that US cities are exposed to three different types of <strong>air pollution,</strong> using data collected by the Environmental Protection Agency between 2010 and 2013, and California is currently considered the worst city that suffers from air pollution in the world, followed by Fresno, Visalia, Bakersfield and Los Angeles. Angeles.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> Nevertheless, there is a positive indication that many regions have witnessed progress in reducing particulate pollution, and this is due to the cleaning up of coal-fired power plants and the reduction of particulate matter in the past period.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> However, the problem of smog remains an important cause of air pollution in US cities and a problem that is getting worse with the passage of time. It is worth noting that smog is the most widespread air pollutant, because it is easily formed at high temperatures, and is expected to increase in light of climate change.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> There is a series of negative health effects resulting from exposure to this type of pollution, which are asthma and heart disease, and constitute severe damage to the central nervous system (the seventh day).</p>