lørdag 4. desember 2021

Delhi pollution: What's causing poor air quality?

India's capital Delhi has experienced some of its worst levels of pollution in many years this winter. It's been blamed on various factors including the burning of farm stubble, on factory emissions, on traffic fumes, on general weather patterns, as well as the fireworks that light up the night sky during the Diwali festival. But how much do each of these factors contribute to the problem?

At the start of December, air pollution levels have once again been categorised as 'severe'. Data for the month of November shows air quality has been at its worst since India introduced its air quality index in 2015. Atmospheric levels of harmful small particles which can be inhaled - known as PM2.5 - are currently far above international guidelines set by the World Health Organization (WHO).