PROTECCIÓN AMBIENTAL y CUIDADO del MEDIO AMBIENTE (SEMARNAT | NOM-052)

Environmental Challenges and Solutions in Mexico

Current Waste Generation Issues

• Millions of people and hundreds of companies in Mexico generate waste, averaging about 328 kilograms per person annually, comparable to the weight of an adult Bengal tiger.

• Many of these wastes are hazardous, posing significant risks to ecosystems ranging from small flora to large fauna like blue whales.

Role of SEMARNAT

• The Secretary of Environment and Natural Resources (SEMARNAT) aims to establish a state policy for environmental protection that reverses ecological deterioration trends and promotes sustainable development.

• SEMARNAT incorporates criteria and instruments across all societal sectors to ensure optimal protection, conservation, and utilization of natural resources through sustainable regional development programs.

Legislative Framework

• SEMARNAT is involved in creating laws and regulations that mitigate negative environmental impacts; however, it is crucial to distinguish between laws (mandatory) and regulations (administrative).

• Laws represent national will expressed through Congress, while regulations reflect the will of administrative powers; violations can lead to judicial intervention.

Understanding Regulations

• A law must comply with constitutional provisions, whereas a regulation must adhere to existing laws; thus, constitutional articles cannot be regulated except by law.

• For example, the General Law on Ecological Balance establishes national legislation while its corresponding regulation pertains specifically to ecological management.

Types of Normative Instruments

• SEMARNAT participates in developing regulations such as Official Mexican Standards (NOM) which are mandatory technical guidelines aimed at protecting the environment and ecosystems.

Understanding Hazardous Substances and Their Environmental Impact

Toxicity and Environmental Risks

• The discussion begins with the dangers of certain substances, such as cyanide and sulfides, which can release harmful gases (e.g., hydrogen cyanide and hydrogen sulfide) when exposed to acidic conditions. These gases can exceed 250 mg/kg for cyanide and 500 mg/kg for sulfides.

• It is highlighted that toxic substances introduced into the environment can be lethal due to their chemical effects. They are found in water, soil, and air, with specific examples including caustic acid vapors, formaldehyde, nitrogen oxides, sulfur oxides, ammonia, and beryllium.

Characteristics of Dangerous Waste

• A dangerous waste is defined as a flammable residue that has a flash point below 60.5 degrees Celsius. Solid materials that may ignite through friction or moisture absorption at room temperature are also considered hazardous.

• Gases that can ignite at low concentrations (13% or less by volume in air at 20 degrees Celsius) are discussed. Additionally, oxidizing gases that facilitate combustion of other materials are noted as significant hazards.

Biological-Infectious Waste