The Netherlands’ National Institute for Public Health and the Environment (RIVM) has issued a smog alert for central and southern regions due to a combination of rising temperatures and stagnant winds. The alert, issued Tuesday, affects vulnerable individuals, including those with respiratory conditions, the elderly, and children. Authorities advise these groups to limit strenuous physical activity outdoors. The stagnant air is causing a build-up of particulate matter, increasing the risk of respiratory problems. The RIVM expects air quality to remain poor through Wednesday. This is the first national smog alert of the year, triggered by high ozone levels and fine particulate matter concentrations. Residents are encouraged to follow health advice and monitor air quality updates.