Smog: Buildings are seen shrouded in a thick blanket of haze amid smoggy conditions, a day after celebration of the Diwali festival near New Delhi in Noida, Uttar Pradesh, India on Nov. 05, 2021. According to the World Health Organization, air pollution is one of the biggest environmental threats to human health, alongside climate change. Photo by Shailendra Pandey/Indian Photo Agency (InPA)