
Master of Orion is a turn-based, science fiction strategy game where players aim to dominate the galaxy through diplomacy and conquest. Pollution is a significant concern in the game, as it is the result of industrial waste in colonies and can lead to biome collapse. To prevent pollution, players must manage their production output, invest in pollution-reducing buildings or technology, and consider the natural pollution absorption rates of different biomes. Tolerant races, such as the Silicoids, are immune to pollution and can colonize hostile planets. Players can also utilize mods or workarounds, such as substituting monetary expenditure for efficient technology, to reduce pollution and maintain their production rates.
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What You'll Learn

Reduce industrial waste
In the game Masters of Orion, pollution is the result of industrial waste in a colony. Each biome type has a certain maximum pollution level it can withstand before degrading. The more hostile the biome, the higher its natural rate of pollution absorption.
To reduce industrial waste and prevent pollution, players can adopt several strategies:
- Build fewer industrial structures: Players can limit the construction of industrial buildings that cause pollution, such as heavy industry. Instead, they can focus on non-polluting structures like orbital shipyards, space elevators, and geosynchronous warehouses.
- Substitute monetary expenditure: Instead of constructing industrial buildings, players can substitute them with monetary expenditure by buying out ship productions. This strategy requires a strong economy and good cash flow.
- Research pollution-reducing buildings: Players can research and construct buildings that reduce pollution, such as pollution-reducing structures, pollution processors, and atmosphere renewers.
- Manage pollution levels: Players should monitor and manage pollution levels to prevent them from reaching 100%. This can be done through the pollution clean-up project or by building dedicated structures.
- Terraforming: If pollution accumulates, players can restore the planet through terraforming. However, this is not an ideal solution as it requires time and resources.
- Utilize barren planets: Players can take advantage of barren planets in a system to produce without worrying about pollution since these planets have higher production capacities without generating pollution.
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Choose deep core mining
Choosing deep core mining in Masters of Orion can be a beneficial strategy, especially for mature colonies on large planets. Deep core mining involves utilising advanced structural engineering techniques to construct stable tunnels that extend far into a planet's core. This method of mining boosts production cell values and can even double the industrial output of a planet when fully staffed.
However, one of the main drawbacks of deep core mining is the issue of pollution. As one player points out, the deep core mine is "rather useless since you can't use people on production due to pollution." The more you produce, the more you pollute, and this can lead to a cycle of boom and cleanup. To address this, players can invest in pollution control structures such as the Atmosphere Renewer, Toxic Processor, Pollution Processor, and Core Waste Dump. These structures can reduce pollution levels and, in the case of the Core Waste Dump, even provide unlimited pollution control.
To minimise pollution while utilising deep core mining, players should aim to balance their production levels with the planet's natural rate of pollution absorption. This involves careful management of production workers and may require periodically moving workers to another slot to reduce pollution levels. Additionally, players can consider investing in pollution-handling capacities, such as the Nano Technology choices, to better prepare for deep core mining later in the game.
In summary, deep core mining can be a powerful strategy in Masters of Orion, particularly for mature colonies on large planets. While it offers significant production bonuses, it also presents the challenge of managing pollution levels. Players can address this by utilising pollution control structures, balancing production with the planet's absorption rate, and investing in pollution-handling technologies to maintain a manageable level of pollution while reaping the benefits of increased industrial output.
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Use pollution control tech
Pollution in Masters of Orion is caused by industrial waste in a colony, and it builds up as a byproduct of production. Each biome has a maximum pollution level that it can withstand before degrading. Managing pollution can be done through various methods, and this answer will focus on utilising pollution control technology.
Firstly, it is important to understand the mechanics of pollution in the game. Each biome has a natural rate of pollution absorption, and each planet has a pollution capacity before the biome degrades by one step. The more hostile the biome, the higher the natural rate of absorption. If your pollution generation, after reduction by pollution control structures, is higher than the natural rate of absorption, then your total pollution will increase. Therefore, the aim is to utilise pollution control technology to reduce pollution generation to a level that is equal to or lower than the natural rate of absorption.
There are several ways to achieve this through technology. One method is to research and construct buildings that reduce pollution. These buildings can provide significant reductions in pollution, such as the combination of a core dump and a toxic processor, which can handle ultra-rich Gaias for non-Industrialists. Additionally, certain races have advantages when it comes to pollution control. For example, the Silicoids can ignore pollution and colonise hostile planets, making them ideal for dealing with polluted environments.
Another strategy is to substitute monetary expenditure for building industrial structures, which can limit pollution. This approach may involve purchasing Geosynchronous Warehouses, although some players find them inefficient due to the time required for construction. Ecologist AI players also prioritise technologies that have benefits for pollution control, so interacting and negotiating with them can potentially provide access to advanced pollution control tech.
Furthermore, there are mods available that can reduce or eliminate pollution. These mods can provide additional options for managing pollution, such as introducing sliders to adjust production and pollution levels.
By utilising these pollution control technologies, players can effectively manage and reduce pollution in their colonies, preventing biome degradation and maintaining the productivity of their planets in Masters of Orion.
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Research pollution-reducing buildings
In the game Master of Orion, pollution is the result of industrial waste in a colony. Each biome type has a maximum pollution level it can withstand before degrading. Once the pollution reaches 100%, the planet's biome drops drastically. Players can manage pollution with the pollution clean-up project or by building dedicated structures.
Researching and constructing pollution-reducing buildings can be an effective strategy for managing pollution in the game. Players can construct buildings that reduce pollution, such as the 100 pollution reduction facility, which becomes available later in the tech tree. Additionally, there are mods that can be used to reduce or eliminate pollution. Some players suggest substituting monetary expenditure for efficient technology, such as Geosynchronous Warehouses, to limit pollution by buying ship buyouts instead of building industrial structures.
In the real world, buildings play a significant role in reducing indoor and outdoor air pollution. Here are some ways to research and implement pollution-reducing buildings:
- Nature-based solutions: Green walls have been shown to offer a high relative reduction of air pollution, including a decrease in NO2 and PM10 levels.
- Construction-based solutions: Photocatalytic paint can be used to achieve reductions in NO, NOx, and NO2 levels.
- Industrial-based solutions: While these solutions promise high levels of pollution reduction, they must be adapted to residential buildings.
- Integration of multiple solutions: Combining various existing and adapted mitigation solutions may lead to even higher pollution reduction rates in urban areas.
- Regulations and standards: Stringent regulations and standards can be implemented to ensure the use of sustainable and green materials in construction, reducing the pollution generated during the production of building materials and improving indoor air quality.
- Energy sources: Switching to clean electricity or other non-combusting energy sources can help reduce air pollution from buildings. Burning gas, wood, and biomass has been shown to have more negative health effects than burning coal in certain regions.
- Ventilation and synthetic materials: Buildings with sufficient ventilation and the avoidance of excessive gases or synthetic building materials can help create clean air spaces.
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Play as the Silicoids
The Silicoids are a race of rock-beings and are the best of the average races in the game. They are immune to the effects of waste and can inhabit any environment from the start of the game without needing to research hostile environment technologies. They also do not need to worry about cleaning up pollution. However, their population grows at only half the rate of other races, and they cannot use technologies like "Atmospheric Terraforming", "Soil Enrichment", or "Advanced Soil Enrichment".
As the Silicoids, it is imperative to get a strong early start in the game and make the most of your early advantages, as these advantages will diminish over time. One strategy is to focus on building and researching things that affect population growth, and to colonize as much as possible at the beginning of the game. Another strategy is to pump out colony ships at the start, each with one destroyer to defend the colony, to counter the problem of slow population growth.
Silicoids also receive a 20% bonus to research in the Computers field, making them effective at spying and defending against spies. However, they suffer a 20% penalty to research in all other fields, so it is important to spy on other civilizations to keep up.
To prevent pollution in the game, it is important to manage the balance between production and the planet's natural rate of pollution absorption. Pollution is generated by manufacturing output, and each biome has a maximum pollution level before degrading. Pollution-reducing buildings and technologies can also help control pollution levels.
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Frequently asked questions
Pollution is the result of industrial waste in a colony. The more you produce, the more you pollute.
Once pollution reaches 100%, the planet's biome drops drastically, usually by one rank class. For example, gaia to terran, terran to arid or swamp, grassland to arid, and tropical to swamp.
Pollution can be managed by using the pollution clean-up project or by building dedicated structures. You can also research and build pollution-reducing buildings, such as core dumps and atmospheric renewers.
Yes, the Silicoids ignore pollution and can colonize even the most hostile planets. However, they have slow population growth. The Tolerant races are also immune to pollution and can research and build flat out.

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