The Brick Kiln Upwind
A brick kiln operates 300 m upwind of a village in Cuttack district. It burns coal and waste tyres. Farmers say dust coats brinjal leaves and yields have fallen; children have frequent coughs. A student project measured suspended particulate matter (SPM) at two sites: 480 µg/m³ at the village edge nearest the kiln and 110 µg/m³ 1.5 km away. Well water near the kiln has pH 6.4, against 7.2 in a control well. The kiln holds a consent-to-operate from the State Pollution Control Board, and 60 local people work there. The nearest houses are 120 m from the kiln boundary and the school is 200 m away. The sarpanch says the kiln 'gives jobs, so we should not complain'. The students must prepare a submission for the district administration.
1. Identify the likely pollutants and explain two pathways by which they affect crops and children.
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Pollutants: suspended particulate matter (PM10 and PM2.5), sulphur dioxide, oxides of nitrogen, carbon monoxide, carbon black, and heavy metals and toxic hydrocarbons from burnt tyres; brick kilns also release fluoride.
Pathway 1 - leaves: dust settles on brinjal leaves, blocks stomata and cuts light, so photosynthesis and yield fall. Acid gases and fluoride can be taken up through leaves or deposited on soil.
Pathway 2 - lungs: fine particles bypass the nose's filters and reach the alveoli; children inhale more air per kilogram of body weight and their lungs are still developing, so coughs and infections rise. The pH fall from 7.2 to 6.4 in the well suggests acid deposition or leachate, which can mobilise metals.
The 480 versus 110 µg/m³ gradient is consistent with the kiln as the source, but it is not proof on its own; wind direction, road dust and household cooking fuel must be checked.
2. Does the consent-to-operate settle the matter? Distinguish point and non-point sources and explain what evidence you would need.
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Point versus non-point: the kiln is a point source - a single identifiable stack. Road dust, agricultural burning and household stoves are non-point (diffuse) sources. A consent-to-operate is a licence with conditions, not a clean bill of health. It usually specifies fuel type, stack height, emission limits and monitoring; burning tyres and high SPM may breach those conditions.
Evidence needed: (i) stack emission tests for SPM, sulphur dioxide and heavy metals; (ii) ambient air quality at several distances and wind directions, including a control site; (iii) leaf-wash and soil samples; (iv) health records from the school and health worker; (v) kiln fuel purchase and ash records. The 480 µg/m³ reading is well above typical 24-hour ambient standards, but the student project must state the instrument, duration and weather. If the kiln is non-compliant, the Board can issue directions; the jobs argument is a reason to plan a transition, not to ignore the law.
3. Recommend an action plan that protects health without destroying the 60 jobs.
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Immediate health protection: stop tyre burning, switch to cleaner fuel or briquettes, install a cyclone or bag filter, increase stack height, and water the kiln yard and roads. These should be enforceable conditions, not voluntary requests. Screen schoolchildren for cough and lung function; keep a symptom register.
Agriculture: advise farmers to wash leaves before sale, plant a tree buffer between kiln and fields, and record yields before and after controls.
Monitoring: monthly SPM at the school and village edge, quarterly stack tests, public display of results, and a complaint register.
Livelihoods: give the 60 workers a transition plan - training, a relocation timeline, or compensation - and involve them in monitoring. A clean kiln can keep most jobs. Closure should be the last step, used only if conditions are repeatedly violated.