In January 2026, Sarajevo ranked among the world’s most polluted cities, with air quality levels exceeding WHO safety limits. New research reveals why this winter smog keeps returning and what could finally change it.

Delhi is one of the world’s most polluted cities in part due to problematic waste-to-energy plants like the one in Okhla. Investigations reveal the release of toxic heavy metals such as cadmium and lead. This poses a serious risk to indoor air quality, especially in buildings with poor ventilation or filtration. This article explores how building technology and clean air strategies can help protect occupants from hidden pollution.

Essential oil diffusers promise relaxation and fragrance, yet their vapours carry hidden dangers. This report explains how different diffuser types work, the psychology of aromatherapy and scientifically noted benefits like stress reduction and better sleep. However, it also details emissions of VOCs, nanoparticles and allergens, highlighting potential health risks for adults, children and pets.