November 10, 2015 3:00 AM EST
N ew Delhi’s notorious smog levels are about to get far worse , as they do around this time every year, as Indians gear up to celebrate Diwali (or Deepavali) — the annual festival of lights.
The Indian capital’s meteorological department warned citizens with heart and lung ailments to stay indoors this week because of “severe” pollution from the widespread bursting of firecrackers, which is customary during the festival, according to the Press Trust of India.
“There is enough moisture in the air and atmospheric holding capacity is quite high for particles emitting from firecrackers,” said Gufran Beig of the government-run agency System of Air Quality, Weather Forecasting and Research (SAFAR).
The haze will be particularly bad on Nov. 12 and 13, with the concentration of pollution-related particles — PM2.5 and PM10 — projected to increase by 148% and 170% respectively.
New Delhi is already one of the world’s most-polluted cities but gets markedly worse during Diwali, which primarily signifies the triumph of good over evil.
Gathering of the Faithful: LIFE at India's Colossal Kumbh Mela, 1953 Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images Not originally published in LIFE. Scene during the Kumbh Mela, India, 1953.James Burke—Time & Life Pictures/Getty Images More Must-Reads from TIME Why Trump’s Message Worked on Latino Men What Trump’s Win Could Mean for Housing The 100 Must-Read Books of 2024 Sleep Doctors Share the 1 Tip That’s Changed Their Lives Column: Let’s Bring Back Romance What It’s Like to Have Long COVID As a Kid FX’s Say Nothing Is the Must-Watch Political Thriller of 2024 Merle Bombardieri Is Helping People Make the Baby Decision