Public transport in Brussels faces severe disruption on Monday as the socialist union CGSP initiates filter blockades at multiple MIVB depots.
The industrial action effectively paralyzes the city's bus and tram networks, leaving commuters with limited options as the metro system continues to operate on a normal schedule.
The timing of the strike exacerbates existing pressures on Belgian infrastructure.
A second extreme heatwave has swept across Europe in less than a month, forcing authorities in both France and Belgium to implement emergency measures.
The rapid succession of high-temperature events is testing the resilience of public services and transport networks already strained by summer demand.
In neighboring France, the crisis has prompted regional leaders to urge residents to work from home to reduce congestion on disrupted transit lines.