How are materials playing a role in ensuring adequate ventilation and minimising indoor pollutants in high-density urban buildings?

Buildings should prioritise low-VOC paints, adhesives, sealants, flooring, and furnishings to reduce the release of indoor pollutants. Materials that resist moisture accumulation and microbial growth are equally important, particularly in humid climates where mould can become a significant indoor air quality concern.

However, materials alone cannot solve indoor pollution challenges. Building envelopes should be designed to balance airtightness with controlled ventilation. In high-density urban areas where outdoor pollution levels may be elevated, filtered mechanical ventilation systems are often necessary to ensure adequate fresh air without introducing indoor particulate matter and other pollutants. Combining low-emission materials with well-designed ventilation systems offers the most effective strategy for creating healthier indoor environments.

As India rapidly expands its underground metro infrastructure, what parameters should be considered to avoid air quality challenges?

Underground metro systems present unique air quality challenges due to enclosed environments, high passenger volumes, and particulate matter generated by wheel, rail, and brake wear. Effective ventilation design should therefore be incorporated from the earliest stages of planning.

Key considerations include maintaining adequate air exchange rates, deploying high-efficiency filtration systems, and continuously monitoring priority pollutant concentrations within stations and tunnels. Station design should minimise pollutant accumulation in waiting areas and platforms while ensuring efficient airflow pathways.

Equally important are the adoption of low-emission braking technologies, the regular maintenance of rolling stock and tracks, and the integration of real-time air quality monitoring systems. As metro networks expand across Indian cities, air quality management should be treated as a core component of infrastructure design rather than an operational afterthought.