Dar es Salaam’s chronic traffic congestion is increasingly being reframed as an environmental and economic risk, drawing the National Environment Management Council (NEMC) into what has traditionally been a transport-sector issue.
Just rescently, Works Minister Abdallah Ulega has offered a Sh10 million prize to university engineering students who develop viable solutions to infrastructure challenges, including traffic congestion — signalling political openness to innovation.
NEMC Director General Immaculate Sware Semesi argues that gridlock in the commercial capital has structural implications beyond delayed commutes.
“Traffic congestion is not merely a mobility challenge. It directly affects air quality, public health, climate resilience and national productivity,” she said, citing the council’s mandate under the Environmental Management Act (Cap. 191) to coordinate and advise on mitigation measures.
The environmental dimension is most visible in deteriorating air quality along high-traffic corridors. Concentrations of particulate matter (PM2.5 and PM10), nitrogen oxides and sulphur dioxide — pollutants closely linked to vehicle emissions — are a growing concern in densely populated areas.
According to her, NEMC’s monitoring and data analysis are intended to identify pollution hotspots and guide evidence-based interventions.
“Without reliable data, policy responses risk being reactive rather than preventive,” Ms Semesi said. “Our role is to ensure decisions are grounded in environmental science.”
Policy tools under consideration include mandatory vehicle emission inspections, tighter regulation of ageing vehicle imports and campaigns promoting fuel efficiency and eco-driving.
The enforcement and inter-agency coordination will determine whether such measures translate into measurable reductions in roadside pollution.
Infrastructure expansion, often presented as the primary solution to congestion, also falls under NEMC’s scrutiny. Major road projects, flyovers, commuter rail systems and bus terminals must undergo Environmental Impact Assessments (EIAs) to evaluate projected emissions, noise levels and community displacement.
“We are not opposed to infrastructure development,” Ms Semesi said. “But growth must be balanced with environmental safeguards. Every major transport project must demonstrate how it will mitigate air pollution, noise and social impacts.”
She said compliance monitoring of Environmental Management Plans remains critical, particularly as the government accelerates transport investments to support urban growth.
Beyond regulation, NEMC is advocating a structural shift towards sustainable mobility. Strengthening mass transit systems, expanding pedestrian and cycling networks and integrating park-and-ride facilities into urban design are among the measures being promoted.
Linking congestion management to greenhouse gas mitigation aligns urban transport reform with Tanzania’s broader climate commitments.
Noise pollution is emerging as a parallel challenge. Measurements at major intersections are informing recommendations on noise barriers and zoning adjustments to reduce prolonged exposure in residential areas.
Institutional alignment remains central. NEMC works with the Vice President’s Office (Environment) on policy direction, the Tanzania National Roads Agency (TANROADS) on infrastructure, the Land Transport Regulatory Authority (LATRA) on regulatory oversight, alongside the Tanzania Police Force and local authorities.
Overlapping mandates have historically slowed implementation, underscoring the importance of coordination.
Short-term proposals include targeted vehicle emission inspections in congestion hotspots, a study assessing the public health costs of air pollution in Dar es Salaam and a public awareness campaign to reduce fuel combustion.
Over the medium term, NEMC is pushing for a permanent air quality monitoring network, national green transport guidelines and the introduction of low-emission zones within urban master plans.
While NEMC does not manage traffic flows directly, its environmental oversight gives it growing influence in shaping how congestion is addressed.
The shift reflects a broader policy realignment: treating traffic not simply as an inconvenience, but as a systemic environmental risk with long-term economic consequences for Tanzania’s largest city.