From products to exposure
NOM-010-STPS-2014 has applied since 2016 and governs chemical contaminants in Mexican workplace environments. Its purpose goes beyond identifying dangerous products: it addresses where contaminants are released, who may be exposed and how exposure is assessed and controlled. It connects with workplace chemical agents while establishing requirements specific to Mexico.
The study includes agents present, quantities handled, physical form and toxicological information, supported by safety data sheets. It must be updated when substances, processes, installations or equipment change. A purchasing inventory can omit contaminants generated during work and does not replace this analysis.
Recognition and sampling strategy
Recognition identifies sources, areas, tasks, homogeneous exposure groups and existing controls. Selection of substances and people for sampling follows the standard’s criteria, using earlier results or, when unavailable, hazard, quantity and volatility information.
For example, a measurement in a nearby office may not represent the worker performing open mixing during part of the shift. The strategy needs to explain why the samples describe relevant conditions and how they relate to exposure duration and the activities performed.
Assessment is more than one number
Assessment must be conducted by a laboratory accredited and approved for the relevant scope. Its report should preserve methods, conditions and results. Interpretation uses the applicable values and criteria, including short-term or peak values where relevant, and the prescribed statistical treatment.
A low spot reading does not establish that a process is safe. Foreign limits should not automatically be substituted, and absence from a table does not mean a substance is harmless. Selecting the assessment criterion requires competent review of the particular case.
Control and health follow-up
Measures may address substances, processes, emission, dispersion and work organisation. Measurements must be repeated after technical controls are implemented to check the outcome. Where respiratory protection is needed, it belongs within a programme covering selection, fit, maintenance and training.
Health surveillance is undertaken by suitably experienced professionals and linked to exposures. Prevention records should connect recognition, assessment, action and follow-up. Accumulating laboratory reports without improving the conditions does not complete the required process or demonstrate sustained control of exposure.
