Lower-cost air pollution sensors can fill critical air quality data gaps in India, which experiences very high fine particulate matter (PM2.5) air pollution but has sparse regulatory air monitoring. Challenges for low-cost PM2.5 sensors in India include high-aerosol mass concentrations and pronounced regional and seasonal gradients in aerosol composition. Here, we report on a detailed long-time performance evaluation of a popular sensor, the Purple Air PA-II, at multiple sites in India.

So far in this series, we discussed different aspects of India’s solar PV sector, including taxation, policies, and the journey towards sustainability. In this concluding piece, we focus on popular technologies, innovations, challenges, and opportunities.

India’s solar photovoltaics (PV) market is rapidly growing. However, to reach the ambitious goal of 500 GW of renewable energy by 2030, there is a pressing need to increase installed capacity and generation targets. With only around 62 GW of installed solar capacity achieved by the end of 2022, India fell short of its 100 GW target for the year. Favourable policies, financial support, technological advancements, and a competitive market are essential for further advancing the growth of India’s solar PV sector.

In the previous article, we discussed the gaps in key areas that hamper the sustained growth of India’s solar PV market. In this article, we shift our focus to two critical aspects that are influencing the sector - ALMM and BCD.

Until a few years ago, working on biofuels called for constant justification in the face of electric vehicles (EVs) taking over the world. Today, while there is no doubt that EV adoption has amplified over the years, there is growing awareness of the fact that no decarbonisation strategy is trade-off-free. For instance, for a transition to EVs, existing internal combustion engine (ICE) vehicles and the supporting infrastructure need to be replaced entirely, which is capital intensive.

In 2021, Hanson — a subsidiary of Heidelberg Cement in the United Kingdom — substituted 100% of thermal energy with energy from alternative fuels in one of its cement kilns by using a mixture of hydrogen (39%), glycerine (49%), and meat and bone meal (MBM; 12%) instead of coal. This is the world’s first usage of 100% climate-neutral fuel and one of the first demonstrations of hydrogen-based technology in the cement kiln. Such adaptations, comprising a climate-neutral fuel blend, in the Indian cement industry remain elusive, even in 5% of the plants.

India’s wind capacity target for 2030 is 140 GW, and the current wind installation achieved until April 2023 is 42.8 GW. To achieve the remaining 98 GW, considerable growth rate and comprehensive efforts are needed in the coming years. India has a total wind energy potential of 695GW at 120 metres (National Institute of Wind Energy), which is on par with the solar energy potential of 748GW (National Institute of Solar Energy).

India generates an enormous amount of waste, including municipal solid waste (MSW), industrial waste, hazardous waste, and biological waste. According to the State of India's Environment 2023 report, MSW generation in India is estimated to be around 150,000 tonne per day (TPD). To harness the energy potential of this waste and reduce reliance on landfills, waste-to-energy (WTE) processes are being explored across India.

Any development programme can foster climate adaptation and mitigation benefits; it must also, however, feature self-reflection and system assessments. The renowned ecologist C.S. Holling, who brought resilient thinking to the forefront of socio-ecological studies, asserted that systems must evolve while they build resilience. If the baseline system itself is fundamentally unjust and unsustainable, then evolving to a new system is preferable to belatedly attempting to add resilience.