Air Quality

Air quality metrics for major world cities: particulate matter, nitrogen dioxide, ozone, and AQI.

import polars as pl
import polarise
from polarise.datasets import get_air_quality_data
df = get_air_quality_data()

---

AQI gradient

{ cmap="CET_D12" · built-in or colorcet }

(df.style()
   .gradient("AQI", cmap="CET_D12")
   .fashion_minimal()
   .title("Air Quality Index by City")
   .show()
 )

Air Quality Index by City

City	PM2_5	NO2	O3	AQI	Change_vs_2015
Paris	13.2	38.4	52.6	48	-5.2
Berlin	11.8	26.1	48.2	42	-3.8
Madrid	9.5	31.7	61.3	53	1.2
Rome	15.7	42.3	55.1	58	-2.1
London	12.1	35.8	44.8	45	-4.5

---

WHO limit exceedances

(df.style()
   .highlight_above("PM2_5", value=25.0, fill="#FF6347")
   .highlight_above("NO2", value=40.0, fill="orange")
   .fashion_grid()
   .title("Pollutants Exceeding WHO Limits")
   .footnote("WHO limit: PM2.5 < 25 μg/m³, NO2 < 40 μg/m³")
   .show()
 )

Pollutants Exceeding WHO Limits

City	PM2_5	NO2	O3	AQI	Change_vs_2015
Paris	13.2	38.4	52.6	48	-5.2
Berlin	11.8	26.1	48.2	42	-3.8
Madrid	9.5	31.7	61.3	53	1.2
Rome	15.7	42.3	55.1	58	-2.1
London	12.1	35.8	44.8	45	-4.5

WHO limit: PM2.5 < 25 μg/m³, NO2 < 40 μg/m³

---

Change since 2015

{ cmap="managua_r" · built-in or cmcrameri }

(df.style()
   .gradient_divergent("Change_vs_2015", center=5.0, cmap="managua_r")
   .bar("AQI", fill="lightgreen")
   .fashion_zebra()
   .title("Air Quality Change Since 2015")
   .show()
 )

Air Quality Change Since 2015

City	PM2_5	NO2	O3	AQI	Change_vs_2015
Paris	13.2	38.4	52.6	48	-5.2
Berlin	11.8	26.1	48.2	42	-3.8
Madrid	9.5	31.7	61.3	53	1.2
Rome	15.7	42.3	55.1	58	-2.1
London	12.1	35.8	44.8	45	-4.5