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Air Quality Index (AQI) in Nicolás Romero, Mexico 🇲🇽

Air quality in Nicolás Romero is currently 73 on the US AQI scale, rated Moderate.

Patchy rain nearby
14°C
Patchy rain nearby
AQI INDEX
73
US EPA Standard

PM 2.5 Level
20.9
µg/m³

US EPA Index
2
Moderate
The current Air Quality Index (AQI) in Nicolás Romero is recorded at 73 as of 7 o'clock in the morning local time this Thursday, July 9, 2026. This real-time AQI score is based on the highest-risk pollutant measured by local monitoring stations. According to the US EPA health standard, air quality in Nicolás Romero currently falls into the Moderate category. The PM2.5 pollution levels are currently measured at 20.9 µg/m³. While this AQI level is acceptable for most people, those who are unusually sensitive to air pollution should consider reducing prolonged or heavy exertion outdoors. If you are sensitive to air pollution, check the local weather before heading out. For the AQI across entire Mexico, you can also view the Air Quality Index for Mexico covering other major urban centers and local monitoring stations.

Health Recommendations for Nicolás Romero Residents

⚠️

Air quality is acceptable. However, for some pollutants there may be a moderate health concern for a very small number of people. Sensitive groups should consider reducing prolonged outdoor exertion.

Nicolás Romero Air Pollution: Detailed Pollutant Breakdown

🌿
Good news — Nicolás Romero's air today is cleaner than a single cigarette (about 0.9).
Based on the Berkeley Earth estimate that ~22 µg/m³ of PM2.5 over a day is about one cigarette. Today's PM2.5 in Nicolás Romero is 20.9 µg/m³.
PM 2.5
20.9
µg/m³
PM 10
21.2
µg/m³
Nitrogen Dioxide (NO2)
64.3
µg/m³
Ozone (O3)
22.0
µg/m³
Carbon Monoxide (CO)
233.0
µg/m³
Sulfur Dioxide (SO2)
31.4
µg/m³

Current Weather in Nicolás Romero

🌡️ 14°C (Feels like 9°)
🌬️ 4 km/h NW
💧 87% Humidity
🧭 1020 hPa
👁️ 10.0 km Visibility
☀️ UV Index: 0.2
🌅 Sunrise: 06:04 AM
🌇 Sunset: 07:20 PM
🌡️ Dew Point: 11°C

Nicolás Romero's Main Air Pollutant Today

The main concern in Nicolás Romero right now is NO2 at 64.3 µg/m³, about 2.6x the WHO 24-hour guideline.

Air Quality Health Advice for Nicolás Romero

General publicAir quality is acceptable for most people. Outdoor activity is fine.
Sensitive groupsUnusually sensitive people should consider easing prolonged or heavy exertion outdoors.

Air Quality in Other Cities in Mexico

Browse Air Quality in Mexico by cities in alphabetical order:

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Air Quality in Mexico ›

Frequently Asked Questions about Air Quality in Nicolás Romero

What is the air quality (AQI) in Nicolás Romero right now?

The current air quality index in Nicolás Romero is 73 — categorised as Moderate.

Is the air in Nicolás Romero safe to breathe today?

Today's air quality in Nicolás Romero is rated Moderate on the US EPA scale.

What is the PM2.5 level in Nicolás Romero right now?

The fine-particle (PM2.5) concentration in Nicolás Romero is currently 20.9 µg/m³. PM2.5 is the most health-relevant pollutant — the WHO 24-hour guideline is 15 µg/m³.

What is the PM10 level in Nicolás Romero right now?

The coarse-particle (PM10) concentration in Nicolás Romero is currently 21.2 µg/m³.

What is the main pollutant in Nicolás Romero right now?

The dominant pollutant in Nicolás Romero right now is Carbon Monoxide (CO) at 233.0 µg/m³.

Is it safe to exercise outdoors in Nicolás Romero today?

With air quality currently rated Moderate, outdoor exercise in Nicolás Romero is generally considered safe for most people.

How to Read the Air Quality Index for Nicolás Romero

Good (0-50)

Air is fresh and healthy. Safe for all outdoor activities.

Moderate (51-100)

Acceptable air quality, though sensitive groups should monitor comfort.

Unhealthy (Sensitive) (101-150)

Vulnerable groups (children, elderly) should limit outdoor exertion.

Unhealthy (151-200)

Everyone begins to experience health effects. Stay indoors where possible.

Very Unhealthy (201-300)

Significant health impact for entire population. Emergency conditions.

Hazardous (301+)

Serious health alert: everyone may experience serious life-threatening effects.

Good (0-12)

Fine particles are at minimal, safe levels. Air is optimal.

Moderate (12-35)

Acceptable air, but haze may be present in urban areas.

Sensitive (35-55)

Individuals with heart or lung disease should limit activity.

Unhealthy (55-150)

Particulate levels high enough to cause respiratory irritation.

Very Unhealthy (150-250)

Heavy haze. High risk to cardiovascular health for the public.

Hazardous (250+)

Lethal particulate concentrations. Critical neurological and lung risk.

Good (0-54)

Low levels of dust and coarse particles. Environment is safe.

Moderate (55-154)

Coarse particles may trigger coughing in sensitive groups.

Sensitive (155-254)

Visible dust pollution. Sensitive groups should avoid heavy labor.

Unhealthy (255-354)

Widespread respiratory impacts likely for the population.

Very Unhealthy (355-424)

Dangerous dust and debris levels. Significant warnings issued.

Hazardous (425+)

Extremely high concentrations. Stay inside with filtration.

Good (0-54)

Surface ozone levels are within a safe, natural range.

Moderate (55-70)

Acceptable air, but sensitive individuals may feel chest tightness.

Sensitive (71-85)

Rising ozone can trigger airway inflammation in active children.

Unhealthy (86-105)

Avoid heavy outdoor work during the hottest part of the day.

Very Unhealthy (106-200)

Serious lung function reduction likely across the public.

Hazardous (201+)

Emergency ozone levels. Risk of permanent lung tissue damage.

Good (0-53)

Nitrogen levels are optimal. Safe for everyone.

Moderate (54-100)

Typical background levels for high-density urban areas.

Sensitive (101-360)

Increased risk of respiratory infections for vulnerable groups.

Unhealthy (361-649)

Significant airway inflammation likely near traffic zones.

Very Unhealthy (650-1249)

Acute respiratory distress potential. High-risk groups stay indoors.

Hazardous (1250+)

Toxic concentrations. Immediate health precautions required.

Good (0-4.4)

Carbon Monoxide levels are clean and non-toxic.

Moderate (4.5-9.4)

Acceptable; may affect those with specific heart conditions.

Sensitive (9.5-12.4)

Reduced oxygen delivery to the heart may occur.

Unhealthy (12.5-15.4)

Headaches and fatigue may occur in urban canyons.

Very Unhealthy (15.5-30.4)

Significant cardiovascular distress. Mental confusion possible.

Hazardous (30.5+)

Lethal potential. Immediate risk of neurological collapse.

Good (0-35)

Optimal air quality with no sulfur detection.

Moderate (36-75)

Acceptable air; minor odors possible near industry.

Sensitive (76-185)

Bronchoconstriction possible for active asthmatics.

Unhealthy (186-304)

Respiratory distress likely for the wider population.

Very Unhealthy (305-604)

Significant wheezing and shortness of breath likely.

Hazardous (605+)

Extreme respiratory danger. Significant life risk.

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

How is this AQI calculated?

The primary Air Quality Index (AQI) shown above is calculated using the US EPA Linear Interpolation formula based on PM2.5 concentration (Fine Particulate Matter).

Formula: Ip = [(Ihi - Ilow) / (Chi - Clow)] * (Cp - Clow) + Ilow

Note: While several pollutants (O3, NO2, SO2) are monitored, PM2.5 is used as the primary "driver" for the main index value as it typically represents the highest health risk.

Frequently Asked Questions

What is the main cause of air pollution in Nicolás Romero?

Pollution in Nicolás Romero is primarily driven by 3.6 km/h NW winds, local traffic emissions, and industrial activity, which influence the current PM2.5 concentration of 20.9 µg/m³.

Is the AQI in Nicolás Romero safe today?

Today's AQI is 73, which is categorized as Moderate. This means the air quality is moderate for the general population.