Overview of Light Pollution and ALAN Trends

Artificial Light at Night (ALAN) refers to human-made illumination that disrupts natural darkness. A Nature study (2023) reported a 16% global increase in ALAN between 2014 and 2022, with the sharpest rises in Sub-Saharan Africa and Southeast Asia. India and China are major Asian contributors. Over 80% of the global population lives under light-polluted skies (Falchi et al., Science Advances, 2016), and 23% of Earth’s land area experiences skyglow (Kyba et al., Nature, 2017), underscoring ALAN’s global scale and ecological footprint.

Defining Light Pollution and Its Types

Light pollution is the alteration of natural outdoor light levels by excessive or misdirected artificial lighting. It includes:

• Skyglow: Brightening of the night sky over inhabited areas.
• Glare: Excessive brightness causing visual discomfort.
• Light trespass: Unwanted light spilling into adjacent areas.
• Clutter: Excessive groupings of lights causing confusion.

ALAN is the primary source, driven by urban lighting, billboards, vehicle headlights, and 24×7 commercial activities.

Drivers of Light Pollution in India

• Rapid Urbanization: With 55% of the global population urbanized (UN DESA, 2018), India’s urban population growth intensifies demand for outdoor lighting.
• Unregulated Lighting Infrastructure: Unshielded streetlights and commercial lighting waste 30–50% of light energy (IDA, 2021), contributing to skyglow and energy inefficiency.
• Vehicle Headlights: Over 30 crore registered vehicles in India increase headlight glare and road illumination, compounding ALAN.
• Shift-based Economy: Expansion of 24×7 services in IT, healthcare, and manufacturing sectors sustains continuous night lighting.

Ecological and Health Impacts

• Disruption of Circadian Rhythms: ALAN suppresses melatonin production, linked to sleep disorders, metabolic issues, and increased cancer risk (WHO, 2020).
• Wildlife Disturbance: Nocturnal species experience altered behaviors, migration, and reproduction due to skyglow and glare, threatening biodiversity.
• Energy Wastage and Carbon Emissions: Inefficient lighting increases electricity consumption, inflating municipal bills and carbon footprints.

Legal and Institutional Framework in India

India lacks a dedicated light pollution law. Relevant provisions include:

• Article 48A of the Constitution mandates State protection and improvement of the environment.
• Environment (Protection) Act, 1986, Section 3 empowers the Central Government to regulate environmental pollutants, interpreted to include light pollution.
• Air (Prevention and Control of Pollution) Act, 1981 has been judicially expanded to cover environmental pollutants beyond air.
• National Green Tribunal Act, 2010 enables judicial intervention in environmental disputes, including light pollution cases.

Key institutions include the Central Pollution Control Board (CPCB), Ministry of Environment, Forest and Climate Change (MoEFCC), and Bureau of Energy Efficiency (BEE). The International Dark-Sky Association (IDA) advocates globally, while ISRO provides satellite ALAN data for monitoring.

Economic Dimensions of Light Pollution

• India’s urban lighting market is projected to grow at a 15% CAGR from 2023 to 2030, increasing energy demand and costs.
• Outdoor lighting accounts for approximately 19% of global electricity consumption in public lighting (IEA).
• Wasted light due to poor fixture design causes 30-50% energy inefficiency, translating to billions of rupees lost annually.
• The global smart lighting market, valued at USD 10.5 billion in 2022, is expected to reach USD 25 billion by 2030, representing energy-efficient technology potential.
• Unregulated lighting inflates municipal electricity bills and carbon emissions, undermining economic and environmental sustainability.

Comparative Analysis: India vs United States

Policy Gaps and Challenges

• Absence of specific legal standards or enforceable guidelines on outdoor lighting design and ALAN control.
• Fragmented responsibility among environmental, energy, and urban development agencies.
• Limited public awareness and lack of incentives for adopting energy-efficient, shielded lighting.
• Insufficient integration of ALAN monitoring in urban planning and environmental impact assessments.

Way Forward

• Enact a dedicated Light Pollution Control Act with standards for fixture design, intensity, and timing.
• Adopt and promote smart and LED lighting technologies to reduce energy waste and emissions.
• Establish a national Dark Sky certification program modeled on IDA initiatives to incentivize municipalities.
• Integrate ALAN monitoring using ISRO satellite data into urban environmental management.
• Raise public awareness on health and ecological impacts through targeted campaigns.
• Coordinate between CPCB, MoEFCC, BEE, and urban local bodies for comprehensive regulation and enforcement.

Jharkhand & JPSC Relevance

• JPSC Paper: Paper 3 – Environment and Ecology, Urbanization and Pollution
• Jharkhand Angle: Rapid urban growth in cities like Ranchi increases ALAN; mining and industrial operations extend night-time lighting, impacting local biodiversity.
• Mains Pointer: Frame answers by linking urbanization-driven ALAN to regional health and ecological impacts; highlight need for state-level regulatory measures and public awareness campaigns.