why long chimneys are installed in factories???

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long chimneys are there in factories because they have a lot of dust and pollution in sugar factories etc.....
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Long chimneys are installed in factories so that the nearby places don`t get polluted .
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​The height of a chimney influences its ability to transfer flue gases to the external environment via stack effect. Additionally, the dispersion of pollutants at higher altitudes can reduce their impact on the immediate surroundings. In the case of chemically aggressive output, a sufficiently tall chimney can allow for partial or complete self-neutralization of airborne chemicals before they reach ground level. The dispersion of pollutants over a greater area can reduce their concentrations and facilitate compliance with regulatory limits. That is the reason why long chimneys are installed in factories.
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So that the dirty smoke / soot does not affect us. With the help of long chimneys smoke can be released at great heights, so that chances of soot coming down is less.
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