From winter to summer, Delhi's air has shown a slow but steady rise in carbon monoxide levels this year till May, with monthly data pointing to a consistent pattern of elevated concentrations.
According to data by Envirocatalysts, a research and advisory think tank, the monthly average carbon monoxide concentration (CO)stood at 2.5 milligrams per cubic metre (mg/NM3) in January, matching the level recorded in January 2021 and marking the highest reading for the month in the past five years.
