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Chicago AQ @chicagoaq.bsky.social · 56m

At 6 AM the AQI was 61 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 61 or 12.31 µg/m³
PM10 = 19 or 21.2 µg/m³
NO₂ = 9 or 10 ppb
SO₂ = 1 or 0.83 ppb
O₃ = 16 or NA ppb
CO = 2 or NA ppb

1

Chicago AQ @chicagoaq.bsky.social · 9h

At 9 PM the AQI was 38 , the dominant pollutant was PM2.5 and the air quality is super
PM2.5 = 38 or 10.79 µg/m³
PM10 = 19 or 20.5 µg/m³
NO₂ = 15 or 16 ppb
SO₂ = 1 or 0.76 ppb
O₃ = 34 or 36.93 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 12h

At 6 PM the AQI was 39 , the dominant pollutant was PM2.5 and the air quality is super
PM2.5 = 39 or 7.9 µg/m³
PM10 = 18 or 18.9 µg/m³
NO₂ = 8 or 9 ppb
SO₂ = 1 or 1.27 ppb
O₃ = 37 or 40.27 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 15h

At 3 PM the AQI was 39 , the dominant pollutant was PM2.5 and the air quality is super
PM2.5 = 39 or 8.35 µg/m³
PM10 = 14 or 15.4 µg/m³
NO₂ = 4 or 4 ppb
SO₂ = 1 or 1.15 ppb
O₃ = 31 or 32.95 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 18h

At 12 PM the AQI was 44 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 44 or 9.31 µg/m³
PM10 = 15 or 17.6 µg/m³
NO₂ = 8 or 4 ppb
SO₂ = 1 or 0.88 ppb
O₃ = 15 or 22.5 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 21h

At 9 AM the AQI was 48 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 48 or 9.48 µg/m³
PM10 = 12 or 12.7 µg/m³
NO₂ = 9 or 10 ppb
SO₂ = 1 or 0.69 ppb
O₃ = 6 or 7.36 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 1d

At 9 PM the AQI was 28 , the dominant pollutant was O3 and the air quality is unbelievable
PM2.5 = 16 or 6.74 µg/m³
PM10 = 10 or 11.1 µg/m³
NO₂ = 11 or 12 ppb
SO₂ = 3 or 1.58 ppb
O₃ = 28 or 29.7 ppb
CO = 2 or 0.2 ppb

1

Chicago AQ @chicagoaq.bsky.social · 1d

At 9 AM the AQI was 21 , the dominant pollutant was PM2.5 and the air quality is unbelievable
PM2.5 = 21 or 5.54 µg/m³
PM10 = 12 or 13.3 µg/m³
NO₂ = 19 or 20 ppb
SO₂ = 3 or 2.16 ppb
O₃ = 18 or 19.08 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 6 AM the AQI was 26 , the dominant pollutant was O3 and the air quality is unbelievable
PM2.5 = 23 or 5.02 µg/m³
PM10 = 8 or 9.1 µg/m³
NO₂ = 9 or 10 ppb
SO₂ = 1 or 0.77 ppb
O₃ = 26 or 28.13 ppb
CO = 2 or 0.2 ppb

1

Chicago AQ @chicagoaq.bsky.social · 2d

At 9 PM the AQI was 57 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 57 or 10.73 µg/m³
PM10 = 24 or 26.3 µg/m³
NO₂ = 20 or 21 ppb
SO₂ = 1 or 1.38 ppb
O₃ = 27 or 28.63 ppb
CO = 5 or 0.4 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 6 PM the AQI was 52 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 52 or 11.06 µg/m³
PM10 = 26 or 28.4 µg/m³
NO₂ = 8 or 8 ppb
SO₂ = 1 or 1.27 ppb
O₃ = 33 or 36.1 ppb
CO = 3 or 0.3 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 3 PM the AQI was 47 , the dominant pollutant was PM2.5 and the air quality is okay
PM2.5 = 47 or 7.81 µg/m³
PM10 = 22 or 23.9 µg/m³
NO₂ = 4 or 4 ppb
SO₂ = 1 or 1.45 ppb
O₃ = 33 or 35.91 ppb
CO = 2 or 0.2 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 12 PM the AQI was 52 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 52 or 8.23 µg/m³
PM10 = 26 or 28.3 µg/m³
NO₂ = 20 or 21 ppb
SO₂ = 1 or 0.97 ppb
O₃ = 13 or 14.35 ppb
CO = 1 or 0.1 ppb

Chicago AQ @chicagoaq.bsky.social · 2d

At 9 AM the AQI was 62 , the dominant pollutant was PM2.5 and the air quality is moderate
PM2.5 = 62 or 9.2 µg/m³
PM10 = 20 or 21.7 µg/m³
NO₂ = 20 or 21 ppb
SO₂ = 1 or 0.83 ppb
O₃ = 6 or 7.26 ppb
CO = 1 or 0.1 ppb