Mexico has more than a thousand registered contaminated sites. In many of these areas, exposure to toxic substances is daily, ubiquitous and pervasive, affecting water, soil and air. A large part of this environmental load comes from across the border: tons of waste and industrial materials from the United States enter the country each year for treatment, disposal or recycling.
Documenting the situation is Marcos Orellana, UN special rapporteur on toxic substances and human rights, at the end of an 11-day mission. The picture that emerges is clear: weak environmental standards and insufficient controls have allowed pollution to accumulate over time. “Where standards are weak, the result is legalized pollution,” he explained to the British Guardian newspaper.
The exposed territories
In several cases, these are areas where the health impact is obvious: increased respiratory diseases, cancers, pregnancy complications. Orellana speaks of“sacrifice zones,” an expression used by the local communities themselves.
During the field meetings, by the special speaker, one phrase was repeated over and over again: living in these conditions means not being able to count on a healthy old age. Pollution enters daily life, from the taps to the air we breathe.
A case in point remains the Sonora River, which was contaminated in 2014 by a spill of some 40,000 cubic meters of sulfuric acid from a copper mine. Ten years later, the effects have not been resolved.
Water and air under pressure
In several regions of the country, pollution follows recurring dynamics. In the Atoyac River in the state of Puebla, industrial discharges continue to spill hazardous substances. In other waterways, such as the Tecate and Jamapa, microplastics have been detected.
In the industrial corridor of Tula, Hidalgo State, steel plants, cement plants and refineries operate alongside a river already compromised by untreated wastewater from Mexico City. Here the environmental load is layered: industrial discharges, urban waste, and newly proposed imports of materials for recycling.
In Monterrey, one of the country’s major industrial hubs, the problem is primarily air. Pollution levels are among the highest in North America. Residents speak of widespread symptoms: irritation, asthma attacks, persistent coughing in children. “We have learned to live with the disease,” says a local activist. In some families, chronic coughing in toddlers is perceived as normal.
The waste stream
Government data indicate that hundreds of thousands of tons of waste arrive from the United States each year, including hazardous materials such as lead-acid batteries. Added to these are plastics, paper and metals destined for recycling.
Once across the border, traceability is not always guaranteed. Some of the materials end up in inadequate facilities or in settings where environmental regulations are less stringent. According to Orellana, U.S. consumption and production thus transfer a significant share of the environmental impact to Mexican soil.
Rules and controls
Mexican authorities recognize critical issues in the regulatory system. Limits on industrial emissions appear in several cases to be outdated by the facts or based on dated standards. Controls, so far, have not prevented the accumulation of contamination.
Work is underway to strengthen monitoring, starting with new systems to accurately identify sources of industrial emissions, especially in the most critical areas such as Monterrey. The goal is to assign responsibility directly and initiate cleanups.
On the legislative side, a proposal has been submitted to limit the import of waste that generates more environmental impact than is allowed in the countries of origin. The principle is simple: to prevent regulatory differences from becoming an incentive for pollution displacement.
A balance to be redefined
The issue is part of the larger picture of economic relations between Mexico and the United States. Integrated production chains have strengthened Mexico’s manufacturing industry, but have also concentrated environmental impacts in specific areas of the country.
The revision of the North American trade agreement is cited as a crucial step to update standards and control mechanisms. Without correctives, industrial pressure will continue to burden already exposed territories. For affected communities, the issue remains concrete and everyday: air quality, access to safe water, health protection
