Baja California state legislator Jaime Cantón Rocha has introduced reforms to the state’s Environmental Protection Law that would require authorities to update and publish a pollutant emissions inventory at least every five years. Municipalities ranked among Mexico’s ten most polluted cities would face a stricter deadline of every three years.
The Environmental Commission of the state Congress presented two related measures during a recent plenary session. Cantón Rocha’s proposal targets a long-standing gap: Baja California currently has no recent emissions data, leaving regulators without the information they need to make air quality decisions.
Tijuana and Mexicali in the Crosshairs
Both Tijuana and Mexicali regularly appear on national lists of Mexico’s most polluted cities. Mexicali, home to roughly one million people in the state’s eastern desert, consistently ranks among the worst in the country for particulate matter. Tijuana’s industrial zones and heavy cross-border traffic also contribute to poor air quality along the coast.
Under the proposed reform, the three-year update cycle would apply directly to these municipalities. The inventory would track emissions from industrial, commercial, and service establishments, all of which would be required to submit data to the state’s environmental secretariat.
Aligning State and Federal Standards
The reform would also harmonize Baja California’s air quality standards with Mexico’s federal official norms, known as NOMs (Normas Oficiales Mexicanas). These federal benchmarks set limits on pollutants including particulate matter, ozone, sulfur dioxide, and nitrogen dioxide. Aligning state law with NOMs would strengthen the legal basis for emissions enforcement across the state.
The U.S. Environmental Protection Agency has also identified cross-border air quality as a priority. A 2022 EPA action plan for the California-Baja California border region called for improved state and municipal emissions inventories in binational airsheds, with an initial focus on criteria pollutants and their precursors.
Without a current inventory, Baja California officials have been unable to track pollution trends, identify the worst emitters, or measure the impact of existing regulations. The proposed law would make the data publicly accessible, giving residents timely information about the air they breathe.
The reform still requires approval by the full state Congress before it can take effect. The story was first reported by The Baja Post.