SmogRank / World / Mexico / Baja California / December 2023

Most unhealthy days in Baja California, Mexico, December 2023

2 cities in Baja California, Mexico ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Tijuana, Mexico, 16 of 31 measured days. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

  1. 1Tijuana
    16 of 31
  2. 2Mexicali
    6 of 31
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, December 2023 · All cities in Mexico, December 2023 · Baja California now

Use this board

SmogRank, most polluted cities in Baja California, Mexico, by unhealthy days, PM2.5, December 2023, smogrank.com/mx/region/baja-california/history/2023-12?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.