Transport: The Key to India's Air Quality Strategy

Role of Transport in Urban Air Pollution: The transport sector is a dominant and persistent contributor to urban air pollution, especially in megacities like Delhi. Studies indicate that transport contributes around 20%–40% of annual PM2.5 levels, which can rise to over 50% during peak pollution months when local sources are isolated. This makes it one of the most significant sources of fine particulate matter, which is directly linked to severe health outcomes such as respiratory illnesses and cardiovascular diseases.

Public Health Implications: Transport-related emissions are responsible for approximately 30%–35% of PM2.5-related deaths in Delhi, translating to nearly 13,000 premature deaths annually. Unlike other pollution sources, transport emissions occur at ground level, increasing human exposure. For instance, commuters, traffic police, and street vendors experience significantly higher pollution levels than citywide averages.

Exposure Disparity: Research shows that PM2.5 exposure is about 40% higher for pedestrians, 30% higher for two-wheeler users, and 20%–30% higher for bus commuters. This highlights that transport pollution is not just a systemic issue but also a localized and continuous exposure problem, disproportionately affecting vulnerable populations.

Political and Structural Challenges: Despite clear evidence of its impact, transport remains at the margins of air quality policy primarily due to the political difficulty of implementing structural reforms. Measures such as congestion pricing, road space reallocation, and stricter emission enforcement often face public resistance and require strong political will.

Institutional and Governance Constraints: Effective transport reform demands institutional coordination across multiple agencies, including urban planning, transport authorities, and environmental regulators. This complexity often leads policymakers to favor short-term, visible actions like vehicle bans or odd-even schemes, rather than long-term structural changes.

Preference for Short-term Solutions: Seasonal interventions are easier to implement and politically safer, even though they yield limited results. For example, emergency measures during winter smog episodes in Delhi often fail to produce sustained improvements, highlighting the inadequacy of such approaches. Thus, transport policy remains under-prioritized despite its central role.

Concept of Supply-Side Regulations: Supply-side regulations (SSRs) focus on mandating outcomes rather than incentivizing voluntary behavior. Unlike subsidies, SSRs directly influence what manufacturers produce and supply, ensuring that cleaner technologies become the norm rather than the exception.

Key Mechanisms: SSRs include measures such as fuel efficiency standards, zero-emission vehicle (ZEV) mandates, and phasing out internal combustion engine vehicles (ICEVs). These policies create predictable market signals, enabling manufacturers and infrastructure providers to make long-term investments. For instance, a phased ICEV ban can stimulate demand for electric vehicles and charging infrastructure.

Impact and Benefits: Evidence from international experiences shows that SSRs lead to deeper, more predictable, and sustained emissions reductions. They also align industrial growth with environmental goals, ensuring that cleaner technologies scale effectively. In the Indian context, SSRs can complement existing policies and deliver economic, environmental, and public health benefits at relatively low fiscal cost.

Role of Demand-Side Subsidies: Demand-side subsidies, such as incentives for electric vehicle (EV) purchases, have played an important role in initial market creation. They help reduce upfront costs and encourage early adoption among consumers.

Limitations and Challenges: However, these subsidies have several limitations. First, they can become a fiscal burden on governments if sustained over long periods. Second, they often lead to uneven adoption, benefiting higher-income groups more than lower-income populations. Third, subsidies do not provide long-term certainty to manufacturers and investors regarding market demand.

Comparative Perspective: Unlike SSRs, subsidies rely on voluntary uptake and can be withdrawn or diluted, leading to policy instability. For example, fluctuations in EV subsidy schemes in various countries have created uncertainty in the automotive sector. Therefore, while subsidies are useful in the early stages, they must be complemented with robust regulatory frameworks to ensure sustained and equitable transition.

Multiple Co-benefits of Transport Reform: Transport reforms aimed at reducing emissions often generate wide-ranging co-benefits. For instance, promoting public transport and non-motorized mobility reduces congestion, leading to shorter travel times and improved productivity.

Case Study – Delhi and Global Examples: In Delhi, the expansion of the metro network has not only reduced vehicular emissions but also improved urban mobility and accessibility. Similarly, cities like Copenhagen and Amsterdam have prioritized cycling infrastructure, resulting in lower pollution levels, healthier populations, and reduced traffic congestion.

Broader Impacts: Cleaner transport systems also enhance road safety and reduce noise pollution. Additionally, the transition to electric mobility can stimulate industrial growth and job creation in sectors such as battery manufacturing and charging infrastructure. Thus, transport reform is a multi-dimensional strategy with significant socio-economic and environmental benefits.

Integrated Policy Approach: A comprehensive strategy would require a multi-pronged and long-term approach focusing on both regulatory and infrastructural measures. First, I would introduce a time-bound phase-out of ICE vehicles with clear interim targets, ensuring a gradual but irreversible transition to zero-emission vehicles.

Strengthening Regulations and Infrastructure: Second, I would implement stringent fuel efficiency standards and ZEV sales mandates to ensure that manufacturers align with environmental goals. Simultaneously, significant investment would be made in public transport systems, including buses and metro networks, along with last-mile connectivity solutions.

Addressing Exposure and Equity: Third, targeted interventions would focus on high-exposure groups such as traffic police and street vendors by creating low-emission zones and improving urban design. Finally, public awareness campaigns and behavioral nudges would complement structural reforms. This integrated strategy would ensure sustained reductions in pollution while promoting equitable and inclusive urban mobility.