By Priyanjana Pramanik, MSc. Reviewed by Benedette Cuffari, M.Sc. Oct 30 2024 Long-term exposure to PM2.5 pollution significantly raises asthma risk for children and adults, contributing to around 30% of global asthma cases. Study:  Long-term exposure to PM2.5 has significant adverse effects on childhood and adult asthma: A global meta-analysis and health impact assessment. Image Credit: Shutterstock AI/Shutterstock.com In a recent study published in One Earth , researchers review existing