Phase Out Fixed-Chimney Brick Kilns to Cut Dhaka's Winter PM2.5

Diagnosis

Bangladesh has roughly 7,000 brick kilns, and they are a major contributor to Dhaka's PM2.5 during the winter burning season (per the curated note). This is not a diffuse, hard-to-locate source. It is a finite, fixed, countable population of point emitters that concentrate around the capital and fire mostly between the dry-season months when air quality is already worst. That combination, a bounded number of large fixed sources driving a seasonal public-health emergency, is exactly the kind of problem where regulation can produce a visible result, because every unit of progress is attributable to a specific licensed site. The reason to act now is the seasonality: each winter that passes without a kiln-level transition repeats the same exposure for Dhaka's population, and the longer dirty kilns keep operating the deeper the sunk capital that owners will resist writing off later.

Recommended actions

1. Build the authoritative kiln register. Owner: Department of Environment (DoE). Mechanism: a single national kiln registry, geotagged, holding every one of the roughly 7,000 sites with its location, technology type, licence status, and proximity to the capital and to schools, hospitals, and settlements. The DoE can task its district offices to verify entries. Observable signal: a published count of registered kilns that converges toward the roughly 7,000 estimate, with no unregistered kiln able to legally receive fuel or sell brick.
2. Tie the operating licence to technology and location. Owner: DoE. Mechanism: condition each annual operating clearance on the kiln meeting a cleaner-firing standard and respecting siting buffers around populated and ecologically sensitive areas. The Forest Department (supporting body) enforces the buffer rule where kilns sit near or draw fuelwood from forest land. Observable signal: a falling share of licensed kilns using the dirtiest fixed-chimney technology, season over season, in the published register.
3. Sequence enforcement by airshed, starting with Dhaka. Owner: DoE. Mechanism: prioritise inspection, licence revocation, and closure orders against unregistered and non-compliant kilns in the Dhaka airshed first, where the winter PM2.5 burden is concentrated, before extending the same drive outward. Observable signal: a documented set of closure and conversion orders executed in the Dhaka airshed ahead of the next burning season.
4. Make fuel and brick demand work for the transition. Owner: DoE, coordinating with public-procurement users of brick. Mechanism: direct that government and government-funded construction preferentially purchase from registered, compliant kilns, turning the largest single buyer into a lever for conversion. Observable signal: public tenders that specify compliant-kiln sourcing, and registered compliant kilns reporting rising order volume relative to non-compliant ones.
5. Stand up the seasonal monitoring loop. Owner: DoE. Mechanism: a winter-season kiln emissions and compliance reporting cycle, feeding inspection priorities back into the register so that each kiln's licence status updates with its measured performance. Observable signal: a repeatable annual report that links Dhaka winter PM2.5 readings to kiln compliance and shows the share of the fleet meeting standard rising each year.

Sequencing (first 12 months)

First, the DoE builds the geotagged register, because nothing downstream (licensing, prioritised enforcement, procurement preference) can run without knowing where the roughly 7,000 kilns are and what technology each uses. The register is the unlock. Once it exists, the DoE attaches licence conditions to it and runs the first prioritised enforcement drive in the Dhaka airshed ahead of the coming winter, with the Forest Department covering siting near forest land. Procurement preference and the seasonal monitoring loop layer on top, using the same register as their single source of truth.

Risks and constraints

The binding constraint is political-economic: kiln owners hold sunk capital in fixed-chimney plants and form an organised local interest, so closure and conversion orders will face resistance and pressure on district enforcement officers. Enforcement capacity is the second constraint, the DoE must inspect a large, dispersed fleet with limited field staff, which is why a verified register and a Dhaka-first sequence matter, they concentrate scarce enforcement where the health payoff is largest. The third is the brick market itself: pushing dirty kilns out too fast without a compliant supply ramp risks a brick shortage, so the procurement lever and the licensing standard must move together rather than as a blunt ban.

Bottom line

A finite, mapped, licensed fleet of roughly 7,000 kilns is a tractable target, and the DoE can convert Dhaka's worst winter air source into a measurable downward trend by registering every kiln, conditioning its licence on cleaner technology, and enforcing in the Dhaka airshed first. The decisive first move is the geotagged register, because every later action depends on knowing exactly which kiln is which.