Diwali: The Festival of Lights Across South Asia

Diwali, the Festival of Lights, is one of the most widely celebrated festivals on Earth, observed by over 1 billion Hindus, Sikhs, Jains, and Buddhists across South Asia and the global diaspora. The five-day festival falls between mid-October and mid-November, determined by the Hindu lunisolar calendar, and marks the triumph of light over darkness and knowledge over ignorance.

Introduction

Diwali's geographic reach spans the entire Indian subcontinent — from the Thar Desert of Rajasthan to the tropical coast of Kerala, from the Himalayan foothills of Nepal to the island of Sri Lanka. Each region celebrates with distinct traditions, but the common thread is the illumination of homes, temples, and public spaces with millions of oil lamps (diyas), candles, and electric lights.

In India alone, Diwali is celebrated across 28 states and 8 union territories, covering a landmass of 3.3 million square kilometers. The festival is also a national holiday in Nepal, Sri Lanka, Malaysia, Singapore, Fiji, Suriname, Guyana, and Trinidad and Tobago.

Geographic Spread

• Primary Region: South Asia (India, Nepal, Sri Lanka)
• Countries Celebrating: Over 20 nations
• Population Observing: 1+ billion people worldwide

Diwali's geographic spread mirrors the Indian diaspora, making it one of the most geographically dispersed festivals on Earth. In addition to the Indian subcontinent, major Diwali celebrations occur in the United Kingdom (1.8 million Indian-origin residents), the United States (4.4 million), Canada (1.9 million), Australia (800,000), and across Southeast Asia and East Africa.

Within India, the festival takes dramatically different forms across its diverse geography. In the northern plains of Uttar Pradesh and Bihar, Diwali commemorates Lord Rama's return to Ayodhya after 14 years of exile. In the western state of Gujarat, it marks the new year and is closely tied to the goddess Lakshmi. In southern India, particularly Karnataka, it celebrates Lord Krishna's defeat of the demon Narakasura.

Regional Traditions

• North India: Lakshmi puja, fireworks, family gatherings
• South India: Oil baths, new clothes, Narakasura legend
• West Bengal: Kali puja, artistic decorations
• Nepal: Tihar (5-day festival honoring animals and siblings)

In Varanasi, India's holiest city on the Ganges, millions of floating diyas are released onto the river during Dev Deepawali, creating a river of fire visible from satellite imagery. The ghats (stepped riverbanks) are illuminated with over 1 million earthen lamps, attracting hundreds of thousands of pilgrims.

In Amritsar, Punjab, the Golden Temple (Harmandir Sahib) is illuminated with thousands of lights and candles, and fireworks illuminate the sky above the sacred pool. Sikhs celebrate Diwali as Bandi Chhor Divas, marking the release of Guru Hargobind from Mughal imprisonment. In Nepal, the Tihar festival spans five days, with each day dedicated to honoring different beings: crows, dogs, cows, oxen, and finally brothers and sisters.

History & Origins

• Age: Over 2,500 years old
• Key Texts: Ramayana, Skanda Purana
• UNESCO Recognition: Added to Representative List in 2021

Diwali's origins stretch back over 2,500 years, with references in ancient Sanskrit texts including the Padma Purana and Skanda Purana. The festival's association with the return of Lord Rama to Ayodhya is narrated in the Ramayana, one of Hinduism's two great epics, estimated to have been composed between 500 and 100 BCE.

For Jains, Diwali marks the nirvana (spiritual liberation) of Lord Mahavira in 527 BCE. For Sikhs, it commemorates the foundation stone of the Golden Temple in 1577 and the release of Guru Hargobind from prison in 1619. These overlapping religious significances have made Diwali a uniquely multi-faith celebration.

Environmental Impact

• Fireworks Pollution: PM2.5 levels spike 300–900% in Delhi
• Diya Oil Used: Millions of liters of mustard oil
• Electricity Surge: Power demand rises 15–20% nationally

Diwali's environmental impact is a growing concern, particularly in India's densely populated northern cities. In Delhi, post-Diwali air quality regularly reaches "severe" levels, with PM2.5 concentrations exceeding 500 µg/m³ — more than 30 times the WHO guideline. The Supreme Court of India has imposed restrictions on fireworks in several cities, promoting "green crackers" with reduced emissions.

The festival also creates enormous waste from packaging, decorations, and spent fireworks. However, the traditional practice of lighting earthen diyas with mustard oil is inherently sustainable, and many communities are returning to traditional celebrations as environmental awareness grows. LED lights have also replaced many traditional oil lamps in urban areas, reducing fire hazards.

Dates & Celebrations

• Calendar: Hindu lunisolar (Kartik month)
• Duration: 5 days (Dhanteras to Bhai Dooj)
• 2026 Date: November 8, 2026 (approximate)

The five days of Diwali each have distinct significance: Dhanteras (wealth worship), Naraka Chaturdashi (early morning oil baths), Diwali proper (Lakshmi puja and illumination), Govardhan Puja (honoring nature), and Bhai Dooj (celebrating siblings). The central day of Diwali falls on the darkest night of the lunar month (Amavasya), making the contrast of millions of lights against total darkness especially dramatic.

Gift-giving is central to the celebration: Indians spend an estimated $10 billion on Diwali-related purchases, including gold, electronics, clothing, and sweets. The festival marks the beginning of the Hindu financial new year for many business communities, and account books are ceremonially opened with prayers to Lakshmi, the goddess of wealth.

Key Facts

• Diwali is celebrated by over 1 billion people across 20+ countries.
• The festival spans 5 days, with each day having distinct traditions and significance.
• In Varanasi, over 1 million earthen lamps illuminate the ghats of the Ganges during Dev Deepawali.
• Diwali-related spending in India exceeds $10 billion annually.
• The festival has roots stretching back over 2,500 years across Hindu, Sikh, Jain, and Buddhist traditions.

Fun Facts

• NASA satellites can detect the increase in light across the Indian subcontinent during Diwali night.
• The city of Ayodhya set a world record in 2024 by lighting over 2.5 million diyas simultaneously on the banks of the Sarayu River.
• In some regions of India, Diwali gambling is considered auspicious — playing cards is seen as invoking the favor of Lakshmi.
• The Golden Temple in Amritsar doubles its daily free meal service during Diwali, feeding over 200,000 people per day.

Final Thoughts

Diwali is a festival that transcends religious boundaries and geographic borders, illuminating communities from the Himalayas to the Caribbean. Its diverse regional traditions reflect the extraordinary cultural and geographic variety of South Asia, while its global spread demonstrates the enduring power of light as a universal symbol of hope and renewal.