A Pacoima sensor recorded higher air pollution than a reference monitor in nearby Reseda

Difference in average daily Air Quality Index (AQI) between Pacoima Beautiful and Reseda air sensors

Days when Pacoima

had a higher AQI

than Reseda

+30 AQI

+20

+10

0

−10

−20

Days when Pacoima

had a lower AQI

−30

July

2025

Sept

Nov

Jan

2026

March

May

Days when Pacoima

had a higher AQI

than Reseda

+30 AQI

+20

+10

0

−10

−20

Days when Pacoima

had a lower AQI

−30

July

2025

Sept

Nov

Jan

2026

March

May

Days when Pacoima

had a higher AQI

than Reseda

+30 AQI

+20

+10

0

−10

−20

Days when Pacoima

had a lower AQI

−30

July

2025

Sept

Nov

Jan

2026

March

May

+30 AQI

Days when Pacoima

had a higher AQI

than Reseda

+20

+10

0

−10

−20

Days when Pacoima

had a lower AQI

−30

July

2025

Sept

Nov

Jan

2026

March

May

+30 AQI

Days when Pacoima

had a higher AQI

than Reseda

+20

+10

0

−10

−20

Days when Pacoima

had a lower AQI

−30

July

2025

Sept

Nov

Jan

2026

March

May

Guardian graphic. Source: South Coast Air Quality Management District