Several cities are notorious for their photochemical smog including Beijing, Mexico City and Los Angeles. The three mentioned here are just examples and not an exhaustive list. Los Angeles has had problems over the years because of the many cars, lots of sunshine, and geography and weather that tend to keep the air confined to the same area for a prolonged period. Mexico City has had problems for many of the same reasons as Los Angeles, but compounded by its high altitude which allows the UV radiation (which contributes to the formation of photochemical smog) to be more intense. Beijing suffers from heavy photochemical smog due to a combination of a large population a surfeit of heavy industry nearby and a relative lack of regulations or technologies to limit the release of the precursors to photochemical smog. Of the three cities used as examples Bejing now has, by far, the worst problems with photochemical smog. During the Bejing Olympics, they shut down most industry around the city and limited the use of cars by the population and still had very noticeable photochemical smog. Many atheletes had expressed concerns about how bad the air was expected to be in Bejing, but by implementing drastic measures, the Chinese government was able to bring it down to a tolerable level for the few weeks of the Olympics. Normal conditions in and around Bejing are normally much worse that what was present during the Olympics.
Recently, Mexico City has become notorious for photochemical smog, however most industrial cities are at some risk, especially those prone to temperature inversions like Los Angeles.
New Zeland is famous for its photochemical smog.
London
Mexico
Photochemical smog can occur most anywhere. London-type smog comes from factories and the burning of coal and fossil fuels, where photochemical smog comes from hydrocarbons and nitrogen oxides mixing with sunlight.
Mexico :p
japan
Beijing, Mumbai, Mexico city
Photochemical smog is a type of smog made when hydrocarbons and nitrogen oxides mix with sunlight.
There are two major types of smog: photochemical and industrial smog. Photochemical smog is created through a reaction by which air pollutants are struck by sunlight, and form particulate matter and tropospheric ozone. The air pollutants that are most responsible for this type of smog are nitrogen oxides (NOx) and volatile organic compounds (VOCs). Photochemical is especially a problem in areas with many cars, coal-burning power plants, and the right weather conditions. Los Angeles, CA is a city that often has to deal with photochemical smog.
Photochemical smog is caused by the action on chemicals of sunlight.
photochemical smog is formed by a complex process . photochemical smog irritates breathing passages, plants, and damage rubber,plants,and some plastics
There are two major types of smog: photochemical and industrial smog. Photochemical smog is created through a reaction by which air pollutants are struck by sunlight, and form particulate matter and tropospheric ozone. The air pollutants that are most responsible for this type of smog are nitrogen oxides (NOx) and volatile organic compounds (VOCs). Photochemical is especially a problem in areas with many cars, coal-burning power plants, and the right weather conditions. Los Angeles, CA is a city that often has to deal with photochemical smog.