What is an environmental contingency? These are the pollution levels required to activate it

In Mexico City (CDMX), environmental contingencies are activated when air pollution levels reach specific thresholds, aiming to mitigate health risks from poor air quality. The primary contributors to pollution in the city are identified as industrial activities and vehicular emissions. These contingencies involve regulatory measures to reduce emissions and protect public health during high pollution episodes. Understanding the pollution levels that trigger these contingencies is crucial for policymakers and the public to respond effectively.