New Delhi, Dec. 25 -- Particulate matter (PM) components such as sulphate, ammonium, elemental carbon, and soil dust, when present together, are associated with a higher risk of mental health conditions, including depression, among older adults than exposure to PM2.5 alone, according to a study published on Monday.

The findings, published in the journal JAMA Network Open, reported that these outcomes were linked to long-term exposure, with the impact being significantly more pronounced among older adults who have comorbid conditions such as cardiometabolic and neurological disorders.

"Our results confirmed that the combined positive association of PM2.5 mixtures with depression risk was much higher than PM2.5 alone, and further revealed t...