SimCity consists of residential zones, industrial zones and commercial zones. These zones help in building houses so that people may live there. Sims can purchase products and work at offices at commercial zones while industries provide employment and manufacture products that can be bought and sold. All these generate revenue for the town as they help in paying taxes to the city
Tech level 1: This consists of dirty factories that are located in industrial zones. Dirty jobs are those that require cheap labor and cheap lands. These include work like smelting and welding. These factories cause heavy pollution to the neighboring areas especially to the residential areas. They do not require much power or water. They provide low paying jobs but however contribute to the tax of the city.
Tech level 2: This level requires building Community Colleges before starting on tech level 2. These colleges are required to provide workforce that is skilled and specialized. As these areas are much cleaner than the first level which has polluting industries, these buildings generate higher revenue through taxes. This zone can further be upgraded by providing various industries near the Community College so that the Sims can be employed at nearby distances. There are many manufacturing industries in this area. They also add to the pollution but are less polluting that the dirty industries. Manufacturing industries generally found are in textiles, machinery and products. There is a simcity buildit hack which leads to free resources in the game , if you want a shortcut in the game then this is the best option for you.
Tech Level 3: This level consists of industrial buildings that are high tech. It requires a University within it to reach this level. This area is the least polluted and also generates high taxable income. But the expenses are equally high. This area can be upgraded by electronic specialization through which university graduates can work in big companies that produce high cost electronic gadgets such as computers and televisions and compete globally in sales. These are clean industries which consist of all types of hi-tech industries such as laboratories, electronic appliances, production, research centers, etc. The workers here are most educated and require good transport and trade facilities. Special requirements consist of healthcare, sanitation, power and water so that these industries can be more productive.
Industries should be pollution free. They should be able to provide employment so that residents can come to these spots to get employed and earn Simoleons. With more employment, traffic problems and transport problems have to be met. Industries require workers and unless these facilities are provided, workers cannot come to work and industries have to quit. They also require train stations that have good connections for safe travel and transport. Trade requires ports for ship and air so that cargo can be transported. Lower tech industries cause toxic pollution which reduces land value while high tech industries are pollution free and have high land values and generate high tax payment to the city. Simoleons are of utmost importance to the industrial development which can be hard earned or come in plenty through the simcity buildit guides.