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The 2020 Amendment in Essential Commodities Act 1955 : A Paradigm Shift
The Essential Commodities (Amendment) Act, 2020 aimed to reduce excessive government intervention in agricultural markets and encourage private investment. 

Shankar IAS Parliament

Deregulation: Cereals, pulses, potatoes, onions, edible oilseeds, and oils were removed from the regular list of essential commodities.
Emergency Triggers: The government can only impose stock limits during extraordinary circumstances such as war, famine, or extreme price rise (100% rise in horticultural produce/50% rise in non-perishables).
Exemptions: Stock limits do not apply to processors, value chain participants, or exporters, encouraging investment in storage infrastructure

Top Pollutants

🛑 Particulate Matter (PM_{10} & PM_{2.5})
• The "Secondary" Trap: UPSC often asks if PM is only primary. Correction: PM_{2.5} is frequently a secondary pollutant, formed in the atmosphere from SO_2, NO_x, and NH_3 (ammonium sulfate/nitrate).
• Black Carbon vs. Brown Carbon: * Black Carbon (BC): Pure carbon from incomplete combustion (diesel, brick kilns). It has a warming effect (high GWP) and lowers the albedo of glaciers (Himalayan melting).
• Brown Carbon: Comes from biomass burning. It absorbs UV light and contributes to the "Atmospheric Brown Cloud."
• Regulatory Base: NCAP targets a 40% reduction in PM concentration by 2026 (Base year 2017).

⚛️ 2. Nitrogen Dioxide (NO_2)
• Photochemical Role: It is the primary precursor to Photochemical Smog. In the presence of sunlight, NO_2 breaks into NO + O. The free O atom joins O_2 to form Ground-level Ozone (O_3).
• The "Diesel" Connection: While CO is high in petrol engines, NO_2 is significantly higher in Diesel engines due to higher combustion temperatures.
• Indicator: NO_2 is used as a proxy for total NO_x in the AQI calculation.

🌋 3. Sulphur Dioxide (SO_2)
• The Volcano Link: Natural sources (Volcanoes) contribute significantly, but UPSC focuses on Thermal Power Plants (TPPs).
• FGD Technology: You must know Flue Gas Desulphurization (FGD). The Ministry of Environment has repeatedly extended deadlines for TPPs to install FGD to strip SO_2 from exhaust.
• Lichens as Bio-indicators: Lichens are extremely sensitive to SO_2. Their absence in an area indicates high SO_2 levels (Classic Prelims fact).

🛜 4. Carbon Monoxide (CO)
• Residence Time: Unlike CO_2 which stays for centuries, CO has a short lifespan (months), but it eventually oxidizes into CO_2, contributing to indirect warming.
• The Hemoglobin Math: CO has an affinity for hemoglobin 200–250 times higher than Oxygen. It forms Carboxyhemoglobin, leading to "Silent Killing" in poorly ventilated rooms (Chulhas/Angithis).
• AQI Nuance: It is the only pollutant in the 8-set measured in mg/m³; others are mostly µg/m³.

💮 5. Ground-Level Ozone (O_3)
• The Winter/Summer Paradox: Ozone levels are often higher in summer than winter because it requires high solar radiation (UV) for the chemical reaction between NO_x and VOCs.
• Winter Smog vs. Summer Ozone: Winter smog is PM-heavy; Summer "clear sky" pollution is often O_3-heavy.
• Stomatal Damage: It enters plants through stomata, oxidizing plant tissue and reducing India’s wheat/rice yields by up to 20%.

🛑 6. Ammonia (NH_3)
• The "Only Alkaline" Gas: It is the only basic (alkaline) gas in the atmosphere.
• Eutrophication: When NH_3 settles into water bodies (dry/wet deposition), it leads to Nutrient Enrichment, causing Algal Blooms.
• Hydrogen Connection: Green Ammonia (produced using Green Hydrogen) is the 2026 policy focus to reduce the "Grey Ammonia" footprint from the fertilizer industry.

☢️7. Lead (Pb)
• Neurological Bioaccumulation: It does not degrade. It bioaccumulates in the bones and teeth.
• The "Unleaded" History: India moved to 100% unleaded petrol in 2000. Current sources are smelting, lead-acid battery recycling (informal sector), and paints/pigments.
• Averaging Time: In AQI, Lead is measured over a 24-hour period, but for NAAQS regulatory compliance, it is also monitored annually.

✳️ 8. The "Missing" Pollutants (The Exclusion Trap)
UPSC loves "Which of the following are NOT included in AQI?"
• NOT in AQI: CO_2, Chlorofluorocarbons (CFCs), Methane (CH_4), Benzene, Radon.
• NAAQS vs AQI: NAAQS includes Benzene, Benzo(a)pyrene, Arsenic, and Nickel. If the question says "All 12 pollutants are part of AQI," it is FALSE.
#Environment #Pollution

✅ Top Polluting Industries

✳️ 1. Thermal Power Plants (The "Apex" Pollutant)

Government Focus: Under the Perform, Achieve, Trade (PAT) scheme and the new 2026 Carbon Credit Trading Scheme (CCTS).
• Air Pollution: Huge emitters of SO_2 (due to high sulfur content in Indian coal) and Fly Ash. Fly ash contains heavy metals like Silica, Alumina, and Mercury.
• Water Pollution: Thermal Pollution—releasing hot water into rivers decreases dissolved oxygen, killing aquatic life.
• The "Fly Ash" Detail: UPSC often asks about its use. It is used in Portland Pozzolana Cement, brick manufacturing, and road embankments (not just a waste product).
• Key Regulation: Installation of Flue Gas Desulphurization (FGD) technology is mandatory by 2026 to curb SO_2.

✳️ 2. Iron and Steel Industry

Government Focus: Green Steel initiative and the Purvodaya scheme for Eastern India.
• Process Detail: The Coke Oven process releases highly toxic Polycyclic Aromatic Hydrocarbons (PAHs) and Cyanide.
• Effluents: The "Phenolic Waste" from quenching coke is a major water pollutant.
• Gaseous Emissions: Massive CO_2 footprint (8-10% of global emissions) and CO.
• Waste: Blast Furnace Slag. Detail: Steel slag is now being used by the Border Roads Organization (BRO) for road construction in Arunachal Pradesh.

✳️ 3. Cement Industry

Government Focus: Included in the Hard-to-Abate sectors for the 2070 Net Zero roadmap.
• Chemistry: Pollution occurs during Calcination (heating limestone CaCO_3 to produce Lime CaO). This process inherently releases CO_2 as a chemical byproduct, independent of the fuel used.
• Pollutants: High Particulate Matter (PM) and Thallium (a heavy metal).
• Mitigation: Transitioning to "Waste-Derived Fuels" (burning plastic/tyre waste in kilns) to reduce coal dependency.

✳️ 4. Tanneries (Leather Industry)

Government Focus: Part of the Namami Gange project (National Mission for Clean Ganga).
• The "Chrome" Problem: The "Chrome Tanning" process releases Hexavalent Chromium (Cr VI), which is highly carcinogenic and persistent in the food chain.
• Water Impact: Extremely high Chemical Oxygen Demand (COD) and Total Dissolved Solids (TDS).
• UPSC Detail: Tannery clusters in Kanpur and Unnao are the primary reasons for the "dead zones" in the Ganga.

✳️ 5. Distillery & Fermentation
Government Focus: Ethanol Blending Program (EBP).
• Reason for Pollution: They produce Spent Wash, a dark brown liquid with a BOD (Biological Oxygen Demand) of nearly 50,000–1,00,000 mg/L (for context, domestic sewage is ~200-300 mg/L).
• Eutrophication: High Nitrogen and Phosphorus levels cause oxygen depletion in water bodies.
• Policy: The government mandates Zero Liquid Discharge (ZLD) for all distilleries.

✳️ 6. Fertilizer Industry (Nitrogenous & Phosphatic)
Government Focus: PM-PRANAM scheme and Nano-Urea promotion.
• Nitrogenous: Releases Ammonia (NH_3) and NO_x.
• Phosphatic: Produces Phosphogypsum as a byproduct. Detail: Phosphogypsum contains traces of radioactive elements and Fluorine, making its disposal a major soil pollution concern.
• Groundwater: Leaching of Nitrates causes Blue Baby Syndrome (Methaemoglobinaemia).
#Pollution #Environment

🇮🇳 2 India-flagged LPG tankers cross, efforts on for 22 more ships:Govt

Kharg Island #Mapping