Air Quality in Leiden Today — Live AQI, PM2.5 & PM10, Smog, Weather and Forecast

Latest air quality data: Leiden

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Pollution and air quality forecast for Leiden. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Leiden:

particulate matter (PM2.5) dust - 11 (Good)
particulate matter (PM10) suspended dust - 15 (Good)
ozone (O3) - 55 (Good)
nitrogen dioxide (NO2) - 12 (Good)
sulfur dioxide (SO2) - 1 (Good)
carbon monoxide (CO) - 194 (Good)

Real-time Air Quality Index (AQI) for Leiden, Thursday, August 27, 2026: 1.

AQI 1 Good

What is the air quality in Leiden today? Is the air polluted in Leiden?. Is there smog?

Today (Thursday, August 27, 2026) air quality is good. The air quality has no effect on health. Everyone can continue their outdoor activities normally in Leiden.

What is the current level of PM2.5 in Leiden? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 11 (Good) For comparison, the highest level of PM2.5 in Leiden in the last 7 days was: 12 (Thursday, August 27, 2026) and the lowest: 3 (Friday, August 21, 2026).

What is the level of PM10 today in Leiden? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Leiden is: 15 (Good)

How is the O3 level today in Leiden? (ozone (O3))
55 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
12 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
1 (Good)

How high is the CO level? (carbon monoxide (CO))
194 (Good)

Current data Thursday, August 27, 2026 at 3:00 AM

PM2,5 11 (Good)

PM10 15 (Good)

O3 55 (Good)

NO2 12 (Good)

SO2 1 (Good)

CO 194 (Good)

Data on air pollution from recent days in Leiden

index	2026-08-27	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20
pm25	12 Good	11 Good	8 Good	7 Good	5 Good	4 Good	3 Good	5 Good
pm10	16 Good	14 Good	11 Good	11 Good	9 Good	9 Good	6 Good	8 Good
o3	72 Moderate	70 Moderate	71 Moderate	59 Good	72 Moderate	64 Good	55 Good	50 Good
no2	16 Good	13 Good	9 Good	15 Good	4 Good	5 Good	12 Good	16 Good
so2	2 Good	2 Good	1 Good	1 Good	0 Good	0 Good	0 Good	2 Good
co	216 Good	215 Good	179 Good	206 Good	170 Good	160 Good	160 Good	171 Good

data source »

Quality of life in Leiden

Green and Parks in the City

Leiden 73%

Belgium: 64% Luxembourg: 83% Germany: 78% Denmark: 78% Liechtenstein: 88%

particulate matter PM2.5

Leiden 14 (Moderate)

Pleasure of spending time in the city

Leiden 91%

Belgium: 64% Luxembourg: 85% Germany: 80% Denmark: 86% Liechtenstein: 94%

particulate matter PM10

Leiden 21 (Moderate)

Air Pollution

Leiden 24%

Belgium: 45% Luxembourg: 19% Germany: 25% Denmark: 18% Liechtenstein: 6.3%

Garbage Disposal

Leiden 89%

Belgium: 54% Luxembourg: 84% Germany: 74% Denmark: 80% Liechtenstein: 100%

Availability and quality of drinking water

Leiden 95%

Belgium: 70% Luxembourg: 83% Germany: 82% Denmark: 87% Liechtenstein: 100%

Cleanliness and tidiness

Leiden 80%

Belgium: 46% Luxembourg: 82% Germany: 65% Denmark: 75% Liechtenstein: 94%

Noise and Light pollution

Leiden 8.9%

Belgium: 54% Luxembourg: 29% Germany: 42% Denmark: 32% Liechtenstein: 19%

Water Pollution

Leiden 13%

Belgium: 42% Luxembourg: 19% Germany: 23% Denmark: 19% Liechtenstein: 0%

Source: Numbeo

Leiden

Thursday, August 27, 2026 at 3:00 AM

PM2,5 11 (Good)

particulate matter (PM2.5) dust

PM10 15 (Good)

particulate matter (PM10) suspended dust

O3 55 (Good)

ozone (O3)

NO2 12 (Good)

nitrogen dioxide (NO2)

SO2 1 (Good)

sulfur dioxide (SO2)

CO 194 (Good)

carbon monoxide (CO)

Leiden

index	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26	2026-08-27
pm25	5.1	3.3	3.8	4.7	6.8	8.3	11	12
pm10	8.3	5.9	9.4	9.2	11	11	14	16
o3	50	55	64	72	59	71	70	72
no2	16	12	5.3	4.4	15	9.3	13	16
so2	1.6	0.36	0.18	0.18	0.64	0.8	2.1	1.8
co	171	160	160	170	206	179	215	216

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Netherlands

16-day weather forecast for Netherlands: today around 26°C (clear sky), lows near 10°C. Daily temperature and conditions, updated every day. Strong wind (about 19 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Netherlands

The UV index in Netherlands today is 5.5 (moderate) — unprotected fair skin can burn in about 35 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Leiden — compare nearby locations.

Rotterdam 14 µg/m³
Haarlem 11 µg/m³
Amsterdam 11 µg/m³
Dordrecht 14 µg/m³
Utrecht 10 µg/m³
The Hague 13 µg/m³
Eindhoven 13 µg/m³
Tilburg 14 µg/m³

Frequently asked questions

Is the air safe to breathe in Leiden today?

The current average PM2.5 across Leiden is about 11 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in Leiden?

Right now PM2.5 in Leiden averages about 11 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in Leiden?

Over the past week, the highest daily PM2.5 in Leiden was recorded on Thursday, August 27 (about 12 µg/m³).

What is the UV index in Leiden today?

The UV index in Leiden today is 5.5 (moderate) — unprotected fair skin can burn in about 35 minutes.

Does today's wind help disperse smog in Leiden?

Strong wind (about 19 km/h) is actively clearing smog and dust away.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.