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At 6 PM the AQI was 26 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 19 or NA µg/m³ PM10 = 8 or 9.1 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 1 or 1.21 ppb O₃ = 26 or 28.4 ppb CO = 3 or 0.3 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 3h

At 3 PM the AQI was 34 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 34 or 7.39 µg/m³ PM10 = 11 or 12.1 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 3 or 2.34 ppb O₃ = 22 or 23.74 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 6h

At 12 PM the AQI was 23 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 23 or 5.81 µg/m³ PM10 = 8 or 8.2 µg/m³ NO₂ = 12 or 10 ppb SO₂ = 1 or 1.11 ppb O₃ = 10 or 14.15 ppb CO = 3 or 0.3 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 9h

At 9 AM the AQI was 16 , the dominant pollutant was PM2.5 and the air quality is holy PM2.5 = 16 or 3.98 µg/m³ PM10 = 6 or 6.7 µg/m³ NO₂ = 14 or 15 ppb SO₂ = 1 or 0.69 ppb O₃ = 15 or 16.36 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 12h

At 6 AM the AQI was 18 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 10 or 3.36 µg/m³ PM10 = 8 or 8.7 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.73 ppb O₃ = 18 or 18.86 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 21h

At 9 PM the AQI was 19 , the dominant pollutant was PM10 and the air quality is holy PM2.5 = 9 or 3.23 µg/m³ PM10 = 19 or 19.5 µg/m³ NO₂ = 9 or 10 ppb SO₂ = 1 or 0.59 ppb O₃ = 18 or 19.02 ppb CO = 5 or 0.4 ppb

100 1

Chicago AQ @chicagoaq.bsky.social · 17/10/2026

At 6 PM the AQI was 20 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 9 or 3.96 µg/m³ PM10 = 19 or 21.2 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 0.55 ppb O₃ = 20 or 21.91 ppb CO = 3 or 0.3 ppb

011 1

Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 3 PM the AQI was 31 , the dominant pollutant was PM10 and the air quality is super PM2.5 = 19 or 4.66 µg/m³ PM10 = 31 or 33.2 µg/m³ NO₂ = 14 or 15 ppb SO₂ = 1 or 0.67 ppb O₃ = 12 or 13.19 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 12 PM the AQI was 25 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 25 or 5.62 µg/m³ PM10 = 22 or 23.7 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 0 or 0.5 ppb O₃ = 13 or 14.46 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 9 AM the AQI was 19 , the dominant pollutant was PM2.5 and the air quality is holy PM2.5 = 19 or 3.4 µg/m³ PM10 = 8 or 8.6 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 0 or 0.45 ppb O₃ = 19 or 21.37 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 6 AM the AQI was 14 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 7 or 2.39 µg/m³ PM10 = 7 or 8.3 µg/m³ NO₂ = 6 or 6 ppb SO₂ = 0 or 0.4 ppb O₃ = 14 or 14.63 ppb CO = 2 or 0.2 ppb

020 2

Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 9 PM the AQI was 42 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 42 or 8.86 µg/m³ PM10 = 19 or 21.4 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 0.54 ppb O₃ = 5 or 5.49 ppb CO = 3 or 0.3 ppb

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Chicago AQ @chicagoaq.bsky.social · 16/10/2026

At 6 PM the AQI was 41 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 41 or 9.49 µg/m³ PM10 = 19 or 20.4 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.64 ppb O₃ = 11 or 11.58 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 3 PM the AQI was 38 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 38 or 9.19 µg/m³ PM10 = 17 or 17.5 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 0.65 ppb O₃ = 8 or 8.51 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 12 PM the AQI was 42 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 42 or 7.8 µg/m³ PM10 = 16 or 16.6 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 0.73 ppb O₃ = 9 or 9.72 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 9 AM the AQI was 40 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 40 or 6.07 µg/m³ PM10 = 13 or 14 µg/m³ NO₂ = 10 or 11 ppb SO₂ = 1 or 0.56 ppb O₃ = 11 or 12.36 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 6 AM the AQI was 36 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 36 or 5.69 µg/m³ PM10 = 13 or 13.7 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 1.02 ppb O₃ = 15 or 16.33 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 9 PM the AQI was 33 , the dominant pollutant was NO2 and the air quality is super PM2.5 = 19 or 5.37 µg/m³ PM10 = 10 or 11.1 µg/m³ NO₂ = 33 or 35 ppb SO₂ = 1 or 0.59 ppb O₃ = 17 or 17.82 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 15/10/2026

At 6 PM the AQI was 27 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 27 or 6.17 µg/m³ PM10 = 14 or 14.7 µg/m³ NO₂ = 14 or 15 ppb SO₂ = 1 or 0.56 ppb O₃ = 19 or 20.1 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 3 PM the AQI was 27 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 27 or 6.43 µg/m³ PM10 = 19 or 21.1 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 1 or 0.84 ppb O₃ = 17 or 17.64 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 12 PM the AQI was 43 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 43 or 7.67 µg/m³ PM10 = 19 or 18 µg/m³ NO₂ = 10 or 10 ppb SO₂ = 0 or 0.4 ppb O₃ = 19 or 15.89 ppb CO = 5 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 9 AM the AQI was 51 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 51 or 13.35 µg/m³ PM10 = 21 or 23.3 µg/m³ NO₂ = 12 or 13 ppb SO₂ = 0 or 0.5 ppb O₃ = 23 or 25.12 ppb CO = 5 or 0.4 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 6 AM the AQI was 56 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 56 or 15.79 µg/m³ PM10 = 19 or 20 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 0.61 ppb O₃ = 21 or 23.44 ppb CO = 3 or 0.3 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 9 PM the AQI was 65 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 65 or 17.54 µg/m³ PM10 = 64 or 81.9 µg/m³ NO₂ = 22 or 23 ppb SO₂ = 1 or 0.77 ppb O₃ = 33 or 36.12 ppb CO = 3 or 0.3 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 14/10/2026

At 6 PM the AQI was 66 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 66 or 15.59 µg/m³ PM10 = 56 or 66.4 µg/m³ NO₂ = 8 or 9 ppb SO₂ = 1 or 0.83 ppb O₃ = 38 or 40.68 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 3 PM the AQI was 62 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 62 or 13.52 µg/m³ PM10 = 58 or 70.1 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.96 ppb O₃ = 32 or 34.98 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 12 PM the AQI was 57 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 57 or 11.62 µg/m³ PM10 = 49 or 62.4 µg/m³ NO₂ = 13 or 13 ppb SO₂ = 1 or 0.94 ppb O₃ = 22 or 24.77 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 9 AM the AQI was 61 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 61 or 7.56 µg/m³ PM10 = 39 or 42.2 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 1 or 1.07 ppb O₃ = 25 or 27.49 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 6 AM the AQI was 44 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 44 or 7.26 µg/m³ PM10 = 39 or 42.1 µg/m³ NO₂ = 8 or 9 ppb SO₂ = 3 or 1.5 ppb O₃ = 26 or 28.31 ppb CO = 1 or 0.1 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 9 PM the AQI was 50 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 50 or 10.35 µg/m³ PM10 = 41 or 43.7 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 0.81 ppb O₃ = 32 or 35.4 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 13/10/2026

At 6 PM the AQI was 59 , the dominant pollutant was PM10 and the air quality is moderate PM2.5 = 54 or 10.47 µg/m³ PM10 = 59 or 71.5 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.88 ppb O₃ = 45 or 49.38 ppb CO = 2 or 0.2 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 3 PM the AQI was 59 , the dominant pollutant was PM10 and the air quality is moderate PM2.5 = 56 or 11.95 µg/m³ PM10 = 59 or 71.7 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 1.31 ppb O₃ = 38 or 40.81 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 12 PM the AQI was 59 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 59 or 10.46 µg/m³ PM10 = 48 or 52.7 µg/m³ NO₂ = 25 or 8 ppb SO₂ = 1 or 1.62 ppb O₃ = 14 or 22.99 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 9 AM the AQI was 54 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 54 or 14.28 µg/m³ PM10 = 35 or 38.2 µg/m³ NO₂ = 35 or 37 ppb SO₂ = 1 or 0.91 ppb O₃ = 15 or 16.02 ppb CO = 3 or 0.3 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 6 AM the AQI was 51 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 51 or 10.24 µg/m³ PM10 = 29 or 31.4 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 1 or 0.63 ppb O₃ = 14 or 15.19 ppb CO = 1 or 0.1 ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 9 PM the AQI was 57 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 57 or 12.56 µg/m³ PM10 = 29 or 30.6 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 4 or 2.96 ppb O₃ = 44 or 47.48 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 12/10/2026

At 6 PM the AQI was 56 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 56 or 10.34 µg/m³ PM10 = 24 or 25.6 µg/m³ NO₂ = 5 or 5 ppb SO₂ = 7 or 5.16 ppb O₃ = 44 or 47.51 ppb CO = 1 or 0.1 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 11/10/2026

At 3 PM the AQI was 43 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 43 or 11.96 µg/m³ PM10 = 38 or 40.7 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 4 or 2.51 ppb O₃ = 36 or 39.29 ppb CO = 1 or 0.1 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 11/10/2026

At 12 PM the AQI was 39 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 39 or 8.92 µg/m³ PM10 = 24 or 26 µg/m³ NO₂ = 17 or 18 ppb SO₂ = 1 or 0.89 ppb O₃ = 19 or 20.89 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 11/10/2026

At 9 AM the AQI was 41 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 41 or 8.24 µg/m³ PM10 = 23 or 25.1 µg/m³ NO₂ = 12 or 13 ppb SO₂ = 1 or 0.72 ppb O₃ = 19 or 21.03 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 10/10/2026

At 6 AM the AQI was 39 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 39 or 7.42 µg/m³ PM10 = 37 or 39.5 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.98 ppb O₃ = 31 or 33.93 ppb CO = 1 or 0.1 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 10/10/2026

At 9 PM the AQI was 55 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 55 or 11.17 µg/m³ PM10 = 38 or 41 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 3 or 1.9 ppb O₃ = 28 or 29.86 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 10/10/2026

At 6 PM the AQI was 49 , the dominant pollutant was PM10 and the air quality is okay PM2.5 = 48 or 9.97 µg/m³ PM10 = 49 or 53.1 µg/m³ NO₂ = 8 or 9 ppb SO₂ = 6 or 3.52 ppb O₃ = 33 or 36.17 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 09/10/2026

At 3 PM the AQI was 48 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 48 or 9.16 µg/m³ PM10 = 48 or 52.5 µg/m³ NO₂ = 10 or 11 ppb SO₂ = 1 or 1.35 ppb O₃ = 26 or 28.26 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 09/10/2026

At 9 AM the AQI was 58 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 58 or 8.46 µg/m³ PM10 = 32 or 34.6 µg/m³ NO₂ = 29 or 31 ppb SO₂ = 4 or 2.79 ppb O₃ = 7 or 7.82 ppb CO = 6 or 0.5 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 09/10/2026

At 6 AM the AQI was 56 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 56 or 10.46 µg/m³ PM10 = 28 or 29.9 µg/m³ NO₂ = 25 or 26 ppb SO₂ = 3 or 1.72 ppb O₃ = 6 or 5.88 ppb CO = 3 or 0.3 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 09/10/2026

At 9 PM the AQI was 33 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 33 or 10.55 µg/m³ PM10 = 29 or 30.7 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 1 or 0.87 ppb O₃ = 31 or 33.32 ppb CO = 5 or 0.4 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 09/10/2026

At 6 PM the AQI was 37 , the dominant pollutant was O3 and the air quality is super PM2.5 = 26 or 7.4 µg/m³ PM10 = 36 or 39.5 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 1 or 1.36 ppb O₃ = 37 or 40.05 ppb CO = 2 or NA ppb

010 1

Chicago AQ @chicagoaq.bsky.social · 08/10/2026

At 3 PM the AQI was 47 , the dominant pollutant was PM10 and the air quality is unbelievable PM2.5 = 26 or 7.76 µg/m³ PM10 = 47 or 50.9 µg/m³ NO₂ = 27 or 29 ppb SO₂ = 3 or 1.82 ppb O₃ = 18 or 18.67 ppb CO = 2 or 0.2 ppb

000 0

Chicago AQ @chicagoaq.bsky.social · 08/10/2026

At 12 PM the AQI was 45 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 45 or NA µg/m³ PM10 = 44 or 42.1 µg/m³ NO₂ = 33 or 28 ppb SO₂ = 3 or NA ppb O₃ = 6 or 9.09 ppb CO = 3 or 0.5 ppb

000 0