Medellín Air Quality Watch: Oct 13–24, 2026 Episode

Medellín air quality is officially under watch. The Área Metropolitana del Valle de Aburrá has declared the year’s second air-quality management period, running October 13 to October 24, 2026. According to El Colombiano (published October 14, 2026), Corantioquia adopted the same measure for the rural area.

Short answer, as of October 15, 2026: air quality is moderate. The highest station on October 14 was Tráfico Centro at about 31 µg/m³ (24-hour PM2.5, SIATA), below the national 37 µg/m³ daily limit, and no pico y placa ambiental is in force. This page will be updated if SIATA reports five or more orange stations, or when the period ends on October 24.

What is a “management period”?

It is a preventive declaration, not an emergency. It activates monitoring and emissions controls during the months when the valley traps pollution. The city’s environment office says the rainy and transition seasons, February–March and October–November, bring low clouds that reduce atmospheric turbulence, so pollutants accumulate (Alcaldía de Medellín). The framework is the regional air-quality plan, which classifies the valley as a PM2.5 source area, per El Colombiano.

El Colombiano also reports that El Niño conditions, which it says consolidate in the second half of the year, cut the rainfall that helps clean the air. SIATA’s daily bulletins say critical episodes are most likely in February–April and October–November.

Medellín air quality on October 14, 2026

• About 31 µg/m³ (highest): SIATA’s daily bulletin (24-hour data, cutoff 5 a.m. October 14) lists Tráfico Centro highest at about 31 µg/m³, followed by Fiscalía General (about 24) and Almacén General EPM (about 18). Twelve population stations were green and eight yellow (15–21 µg/m³); with those three traffic-adjacent stations, 11 stations were in the yellow band. None exceeded the national daily limit.
• 5–7 µg/m³: Santa Elena and El Poblado read far lower, per El Colombiano.
• 15 µg/m³: the WHO 2021 Air Quality Guidelines recommend a 24-hour PM2.5 mean of no more than 15 µg/m³ (the annual guideline is 5 µg/m³). Every yellow-band reading that day (15–31 µg/m³) was at or above that guideline.
• 37 µg/m³: the 24-hour limit in Colombia’s Resolución 2254 of 2017, the national standard that SIATA’s bulletin also cites, more than double the WHO figure.

Traffic-adjacent stations read highest. Readings change hourly. Check SIATA for live data.

How the city’s air quality index works

The index (set by Acuerdo Metropolitano 04 of 2018, following Resolución 2254 of 2017, per SIATA) sorts 24-hour PM2.5 into color bands:

Color	PM2.5 (µg/m³, 24-hour)	Official label	Meaning
Green	0–12	Buena	Good
Yellow	13–37	Aceptable	Acceptable/moderate
Orange	38–55	Dañina a la salud de grupos sensibles	Harmful to sensitive groups
Red	56–150	Dañina a la salud	Harmful to everyone
Purple, maroon	Above 150	Muy dañina / Peligrosa	Very harmful / hazardous; SIATA does not publish these bands in the sources we checked, so consult SIATA for its subdivision

Green to orange ranges are from the Alcaldía page; the red range matches Cornare’s air-quality bulletin, which uses the same national scale. A reading of 31 µg/m³ therefore falls in the yellow band.

Is there a pico y placa ambiental?

Not yet. El Colombiano reports no environmental pico y placa for now. Additional mobility restrictions or telework would be evaluated only if SIATA reports a sustained deterioration to orange at five or more stations. SIATA’s forecast gave a medium-low probability of five or more orange stations and a low probability of any station reaching red. Those projections carry uncertainty.

The regular pico y placa still applies; see our guide to the new rotation from August 3. Authorities are reinforcing vehicle emissions controls in coordination with the Metro de Medellín, and Corantioquia is checking vehicles, industries, kilns and quarries.

What visitors and residents can do

El Colombiano’s guidance from authorities and experts:

• Avoid exercising next to congested roads.
• Avoid morning rush hours, since traffic eases after about 10:00 a.m.
• Reduce private-vehicle use (the Metro is a good alternative) and avoid burning.
• Ventilate indoor spaces during lower-traffic periods.

If you have asthma, a heart condition or young children, the “sensitive groups” label at orange applies to you, so check SIATA before outdoor plans. El Poblado’s readings this week were low, but conditions vary by hour and station. If you’re weighing a trip, this is not a reason to cancel. It is a reason to check the data and pick your hours.

FAQ

Is Medellín’s air bad right now? As of October 14 the highest PM2.5 24-hour mean was about 31 µg/m³ (Tráfico Centro), in the yellow (“aceptable”) band, with some areas far lower. Check SIATA for live values.

When does pico y placa ambiental start? It hasn’t. It would be evaluated only if five or more stations sustain orange readings, per El Colombiano.

Is it safe to exercise outdoors? Authorities advise avoiding exercise beside congested roads and morning rush hour, and sensitive groups should check SIATA first. This is general information, not medical advice.

Related reading

• Pico y placa Medellín: new rotation from August 3
• Why the Medellín Metro is Latin America’s safest transit system: a car-free way to get around
• Medellín emergency rooms at 160% overcrowding

This article summarizes published reporting and official pages as of October 15, 2026. It is not medical advice.