Why in the news?
Delhi’s air quality deteriorated sharply in November 2025. A major contributing factor identified is the continued operation of several thermal power plant units within a 300-km radius of Delhi without Flue Gas Desulphurisation (FGD) systems.
What is FGD?
Flue Gas Desulphurisation (FGD) is a pollution-control technology used in thermal power plants and industrial units to remove sulphur dioxide (SO₂) from exhaust flue gases before they are released into the atmosphere.
Status of FGD InstallationThermal Power Plants within 300 km of Delhi
States & Operators
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Why SO₂ Emissions Matter?
- SO₂ converts into secondary PM2.5, the most harmful pollutant for human health.
- Causes: Respiratory diseases, Acid rain and Visibility reduction (smog)
- Travels long distances, affecting entire regions beyond plant boundaries.
| According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions? (2024)
(a) Locomotives using fossil fuels (b) Ships using fossil fuels (c) Extraction of metals from ores (d) Power plants using fossil fuels |
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