People with respiratory or heart conditions, children and the elderly should limit prolonged outdoor activity.
PM2.5
Fine particulate matter — the key air-pollution indicator.
PM10
Coarse dust and airborne particles.
Ozone O₃
Ground-level ozone — irritates the airways, especially in heat and sunshine.
Nitrogen dioxide
Nitrogen dioxide — mainly from traffic and industry.
Sulfur dioxide
Sulfur dioxide — industrial and fuel-burning emissions.
Carbon monoxide
Carbon monoxide — from incomplete combustion, traffic and fires.
Dust
Airborne dust — a key indicator in desert and dusty regions.
Air quality FAQ ❓
What is the air quality in Metro now?
The US AQI is 117 — “unhealthy for sensitive”. People with respiratory or heart conditions, children and the elderly should limit prolonged outdoor activity.
What are PM2.5 and PM10?
These are concentrations of particles up to 2.5 and 10 microns. The smaller the particles, the deeper they penetrate the airways.
Air quality in Metro
Air quality index in Metro (US AQI), PM2.5 and PM10 particle concentrations from Open-Meteo Air Quality. The index shows how safe the air is for walks and ventilation; high values are dangerous for allergy sufferers, children, the elderly and people with respiratory conditions. Data updates several times a day.