The Mexican government has taken tough steps to fight industrial pollution in Monterrey. It fined Zinc Nacional $4.8 million for processing US hazardous waste causing heavy-metal pollution. The government will also introduce Latin America's first industrial air-monitoring system. This new network will track emissions, including heavy metals, from factories to protect public health. Investigations by the Guardian and Quinto Elemento Lab found toxic heavy metals like lead and arsenic around Zinc Nacional’s factory, with pollution worse than many US states. The plant processes toxic dust left from US steel recycling. Zinc Nacional must now follow 24 corrective actions, move some operations away from residential areas, and clean contaminated land. Mariana Boy Tamborrell, Mexico’s environmental attorney, called these actions "a watershed moment" for enforcement. Researcher Martín Soto Jiménez said the air-monitoring network is key and needs to share real-time data publicly. Local residents want full transparency and deadlines to ensure health safety. Zinc Nacional states its emissions are below legal limits and blamed past contamination on previous site operators. However, neighbors remain worried about pollution affecting schools and homes. Mexico’s environment agency is updating pollution standards, aiming to cut allowed particulate emissions by half. Senator Waldo Fernández plans to introduce laws reducing toxic waste imports and enforcing stricter emission controls. Citizen groups in Monterrey are pushing for better air quality laws and filed a lawsuit demanding a federal probe into industrial emissions. Activist Liliana Flores highlighted that pollution affects everyone in the city, causing serious health problems. These moves mark a historic battle against industrial pollution in Mexico and aim to protect millions living near factories.