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Chicago AQ @chicagoaq.bsky.social · 5h

At 9 PM the AQI was 41 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 41 or 11.75 µg/m³
PM10 = 22 or 23.5 µg/m³
NO₂ = 19 or 20 ppb
SO₂ = 1 or 0.79 ppb
O₃ = 30 or 32.01 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 8h

At 6 PM the AQI was 31 , the dominant pollutant was PM2.5 and the air quality is super
PM2.5 = 31 or 7.62 µg/m³
PM10 = 11 or 12.3 µg/m³
NO₂ = 7 or 7 ppb
SO₂ = 1 or 0.97 ppb
O₃ = 31 or 33.5 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 11h

At 3 PM the AQI was 38 , the dominant pollutant was PM2.5 and the air quality is super
PM2.5 = 38 or 7.13 µg/m³
PM10 = 13 or 13.8 µg/m³
NO₂ = 4 or 4 ppb
SO₂ = 1 or 1.2 ppb
O₃ = 25 or 26.98 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 14h

At 12 PM the AQI was 43 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 43 or 8.08 µg/m³
PM10 = 19 or 21.2 µg/m³
NO₂ = 13 or 14 ppb
SO₂ = 1 or NA ppb
O₃ = 7 or 7.51 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 17h

At 9 AM the AQI was 52 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 52 or 8.07 µg/m³
PM10 = 12 or 13.1 µg/m³
NO₂ = 22 or 23 ppb
SO₂ = 1 or 0.69 ppb
O₃ = 3 or 2.54 ppb
CO = 1 or 0.1 ppb

1

Chicago AQ @chicagoaq.bsky.social · 20h

At 6 AM the AQI was 42 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 42 or 8.9 µg/m³
PM10 = 8 or 9.4 µg/m³
NO₂ = 20 or 21 ppb
SO₂ = 1 or 0.99 ppb
O₃ = 6 or 6.28 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 1d

At 9 PM the AQI was 30 , the dominant pollutant was O3 and the air quality is unbelievable
PM2.5 = 17 or 7.07 µg/m³
PM10 = 13 or 13.7 µg/m³
NO₂ = 11 or 12 ppb
SO₂ = 1 or 1.2 ppb
O₃ = 30 or 32.48 ppb
CO = 1 or 0.1 ppb

2

Chicago AQ @chicagoaq.bsky.social · 2d

At 9 PM the AQI was 52 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 52 or 10.97 µg/m³
PM10 = 17 or 17.7 µg/m³
NO₂ = 19 or 20 ppb
SO₂ = 1 or 1.14 ppb
O₃ = 24 or 26.29 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 6 PM the AQI was 28 , the dominant pollutant was O3 and the air quality is unbelievable
PM2.5 = 19 or 4.77 µg/m³
PM10 = 14 or 15.1 µg/m³
NO₂ = 5 or 5 ppb
SO₂ = 4 or 2.67 ppb
O₃ = 28 or 29.82 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 9 AM the AQI was 18 , the dominant pollutant was PM2.5 and the air quality is holy
PM2.5 = 18 or 3.39 µg/m³
PM10 = 9 or 9.5 µg/m³
NO₂ = 15 or 16 ppb
SO₂ = 0 or 0.28 ppb
O₃ = 17 or 17.57 ppb
CO = 0 or 0 ppb

Chicago AQ @chicagoaq.bsky.social · 3d

At 9 PM the AQI was 49 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 49 or 9.97 µg/m³
PM10 = 28 or 30.1 µg/m³
NO₂ = 20 or 21 ppb
SO₂ = 0 or 0.47 ppb
O₃ = 23 or 25.19 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 3d

At 6 PM the AQI was 56 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 56 or 8.97 µg/m³
PM10 = 19 or 21.4 µg/m³
NO₂ = 6 or 6 ppb
SO₂ = 0 or 0.47 ppb
O₃ = 41 or 44.19 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 3d

At 3 PM the AQI was 62 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 62 or 11.06 µg/m³
PM10 = 22 or 23.8 µg/m³
NO₂ = 7 or 7 ppb
SO₂ = 1 or 0.74 ppb
O₃ = 37 or 39.6 ppb
CO = 1 or 0.1 ppb

1

Chicago AQ @chicagoaq.bsky.social · 3d

At 9 AM the AQI was 44 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 44 or 8.41 µg/m³
PM10 = 22 or 24.4 µg/m³
NO₂ = 25 or 26 ppb
SO₂ = 1 or 0.52 ppb
O₃ = 11 or 11.76 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 4d

At 9 AM the AQI was 60 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 60 or 12.27 µg/m³
PM10 = 27 or 29.2 µg/m³
NO₂ = 10 or 11 ppb
SO₂ = 1 or 0.55 ppb
O₃ = 24 or 26.41 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 4d

At 6 AM the AQI was 61 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 61 or 12.06 µg/m³
PM10 = 26 or 28.2 µg/m³
NO₂ = 8 or 8 ppb
SO₂ = 0 or 0.49 ppb
O₃ = 33 or 35.9 ppb
CO = 2 or 0.2 ppb