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At 9 AM the AQI was 33 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 33 or 1.76 µg/m³ PM10 = 7 or 7.6 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 1 or 0.75 ppb O₃ = 7 or 8.25 ppb CO = 5 or 0.4 ppb

010

Chicago AQ @chicagoaq.bsky.social · 4h

At 6 AM the AQI was 23 , the dominant pollutant was NO2 and the air quality is unbelievable PM2.5 = 18 or 5.14 µg/m³ PM10 = 11 or 12.2 µg/m³ NO₂ = 23 or 24 ppb SO₂ = 1 or 0.65 ppb O₃ = 22 or 23.53 ppb CO = 3 or 0.3 ppb

000

Chicago AQ @chicagoaq.bsky.social · 13h

At 9 PM the AQI was 32 , the dominant pollutant was O3 and the air quality is super PM2.5 = 24 or 8.96 µg/m³ PM10 = 19 or 20.8 µg/m³ NO₂ = 14 or 15 ppb SO₂ = 1 or 0.67 ppb O₃ = 32 or 34.84 ppb CO = 2 or 0.2 ppb

020

Chicago AQ @chicagoaq.bsky.social · 02/10/2026

At 9 AM the AQI was 23 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 23 or 4.41 µg/m³ PM10 = 16 or 17.1 µg/m³ NO₂ = 17 or 18 ppb SO₂ = 1 or 0.6 ppb O₃ = 15 or 15.54 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 02/10/2026

At 6 AM the AQI was 19 , the dominant pollutant was PM2.5 and the air quality is holy PM2.5 = 19 or 4.81 µg/m³ PM10 = 11 or 11.6 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 0 or 0.43 ppb O₃ = 18 or 19.18 ppb CO = 1 or 0.1 ppb

000

Chicago AQ @chicagoaq.bsky.social · 02/10/2026

At 9 PM the AQI was 33 , the dominant pollutant was O3 and the air quality is super PM2.5 = 19 or 4.16 µg/m³ PM10 = 12 or 12.7 µg/m³ NO₂ = 6 or 6 ppb SO₂ = 0 or 0.46 ppb O₃ = 33 or 36.06 ppb CO = 5 or 0.4 ppb

021

Chicago AQ @chicagoaq.bsky.social · 02/10/2026

At 6 PM the AQI was 61 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 61 or 12.79 µg/m³ PM10 = 28 or 29.7 µg/m³ NO₂ = 15 or 16 ppb SO₂ = 1 or 0.7 ppb O₃ = 25 or 26.59 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 3 PM the AQI was 64 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 64 or 20.2 µg/m³ PM10 = 34 or 36.5 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 1 or 0.69 ppb O₃ = 19 or 20.62 ppb CO = 3 or 0.3 ppb

000

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 12 PM the AQI was 61 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 61 or 17.11 µg/m³ PM10 = 30 or 35 µg/m³ NO₂ = 26 or 20 ppb SO₂ = 1 or 0.7 ppb O₃ = 3 or 5.98 ppb CO = 3 or 0.3 ppb

000

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 9 AM the AQI was 58 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 58 or 15.99 µg/m³ PM10 = 26 or 28.5 µg/m³ NO₂ = 25 or 27 ppb SO₂ = 1 or 0.69 ppb O₃ = 3 or 2.67 ppb CO = 3 or 0.3 ppb

021

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 6 AM the AQI was 55 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 55 or 15.75 µg/m³ PM10 = 23 or 25.4 µg/m³ NO₂ = 16 or 17 ppb SO₂ = 1 or 0.86 ppb O₃ = 2 or 1.53 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 9 PM the AQI was 54 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 54 or 12.74 µg/m³ PM10 = 21 or 23.1 µg/m³ NO₂ = 19 or 20 ppb SO₂ = 1 or 0.56 ppb O₃ = 28 or 29.94 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 01/10/2026

At 6 PM the AQI was 52 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 52 or 15.67 µg/m³ PM10 = 21 or 23.4 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 1 or 0.62 ppb O₃ = 28 or 29.56 ppb CO = 3 or 0.3 ppb

020

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 3 PM the AQI was 58 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 58 or 12.52 µg/m³ PM10 = 18 or NA µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 0.7 ppb O₃ = 28 or 30.48 ppb CO = 2 or 0.2 ppb

010

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 12 PM the AQI was 54 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 54 or 9.14 µg/m³ PM10 = 22 or 16.7 µg/m³ NO₂ = 13 or 20 ppb SO₂ = 1 or 0.79 ppb O₃ = 22 or 14.63 ppb CO = 3 or 0.2 ppb

010

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 9 AM the AQI was 49 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 49 or 7.2 µg/m³ PM10 = 27 or 29.3 µg/m³ NO₂ = 22 or 23 ppb SO₂ = 1 or 0.98 ppb O₃ = 23 or 25.12 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 6 AM the AQI was 40 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 40 or 6.86 µg/m³ PM10 = 23 or 25.3 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 0.76 ppb O₃ = 39 or 42.19 ppb CO = 2 or 0.2 ppb

020

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 9 PM the AQI was 56 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 56 or 14.53 µg/m³ PM10 = 35 or 37.8 µg/m³ NO₂ = 13 or 14 ppb SO₂ = 1 or 1.38 ppb O₃ = 44 or 47.65 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 30/09/2026

At 6 PM the AQI was 50 , the dominant pollutant was O3 and the air quality is okay PM2.5 = 43 or 11.01 µg/m³ PM10 = 38 or 40.8 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 0.81 ppb O₃ = 50 or 53.82 ppb CO = 2 or 0.2 ppb

010

Chicago AQ @chicagoaq.bsky.social · 29/09/2026

At 3 PM the AQI was 53 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 53 or 7.81 µg/m³ PM10 = 25 or 26.9 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 3 or 1.87 ppb O₃ = 23 or 24.56 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 29/09/2026

At 12 PM the AQI was 69 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 69 or 11.19 µg/m³ PM10 = 31 or 25.9 µg/m³ NO₂ = 13 or 13 ppb SO₂ = 1 or 1.5 ppb O₃ = 5 or 9.58 ppb CO = 3 or 0.3 ppb

000

Chicago AQ @chicagoaq.bsky.social · 29/09/2026

At 9 AM the AQI was 60 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 60 or 15.94 µg/m³ PM10 = 16 or 16.6 µg/m³ NO₂ = 12 or 13 ppb SO₂ = 1 or 1.3 ppb O₃ = 1 or 1.46 ppb CO = 5 or 0.4 ppb

001

Chicago AQ @chicagoaq.bsky.social · 29/09/2026

At 6 AM the AQI was 53 , the dominant pollutant was PM2.5 and the air quality is moderate PM2.5 = 53 or 9.53 µg/m³ PM10 = 37 or 39.6 µg/m³ NO₂ = 25 or 27 ppb SO₂ = 1 or 1.22 ppb O₃ = 8 or 9.01 ppb CO = 3 or 0.3 ppb

000

Chicago AQ @chicagoaq.bsky.social · 29/09/2026

At 9 PM the AQI was 46 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 46 or 4.42 µg/m³ PM10 = 10 or 10.6 µg/m³ NO₂ = 8 or 9 ppb SO₂ = 6 or 3.77 ppb O₃ = 31 or 34.26 ppb CO = 1 or 0.1 ppb

020

Chicago AQ @chicagoaq.bsky.social · 28/09/2026

At 9 PM the AQI was 39 , the dominant pollutant was O3 and the air quality is super PM2.5 = 28 or 9.88 µg/m³ PM10 = 29 or 31.4 µg/m³ NO₂ = 20 or 21 ppb SO₂ = 1 or 0.99 ppb O₃ = 39 or 41.92 ppb CO = 2 or 0.2 ppb

010

Chicago AQ @chicagoaq.bsky.social · 25/09/2026

At 9 AM the AQI was 48 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 48 or 9.31 µg/m³ PM10 = 11 or 11.8 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.91 ppb O₃ = 9 or 10.28 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 25/09/2026

At 6 AM the AQI was 34 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 34 or 7.73 µg/m³ PM10 = 17 or 18 µg/m³ NO₂ = 23 or 24 ppb SO₂ = 1 or 0.62 ppb O₃ = 18 or 19.1 ppb CO = 3 or 0.3 ppb

010

Chicago AQ @chicagoaq.bsky.social · 25/09/2026

At 9 PM the AQI was 42 , the dominant pollutant was PM2.5 and the air quality is okay PM2.5 = 42 or 7.89 µg/m³ PM10 = 19 or 20.6 µg/m³ NO₂ = 16 or 17 ppb SO₂ = 7 or 5.24 ppb O₃ = 37 or 40.23 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 25/09/2026

At 6 PM the AQI was 36 , the dominant pollutant was O3 and the air quality is super PM2.5 = 28 or 4.33 µg/m³ PM10 = 12 or 12.8 µg/m³ NO₂ = 1 or 1 ppb SO₂ = 9 or 5.65 ppb O₃ = 36 or 39.27 ppb CO = 2 or 0.2 ppb

010

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 3 PM the AQI was 27 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 27 or 4.04 µg/m³ PM10 = 15 or 15.8 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 4 or 2.93 ppb O₃ = 21 or 23.11 ppb CO = 2 or NA ppb

000

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 12 PM the AQI was 29 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 29 or 3.92 µg/m³ PM10 = 14 or 14.2 µg/m³ NO₂ = 5 or 7 ppb SO₂ = 1 or 1.02 ppb O₃ = 17 or 20.76 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 9 AM the AQI was 27 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 27 or 3.85 µg/m³ PM10 = 10 or 11.4 µg/m³ NO₂ = 1 or 1 ppb SO₂ = 1 or 0.83 ppb O₃ = 19 or 19.65 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 6 AM the AQI was 24 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 17 or 5.28 µg/m³ PM10 = 11 or 12.4 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 1 or 1.19 ppb O₃ = 24 or 26.24 ppb CO = 1 or 0.1 ppb

000

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 9 PM the AQI was 32 , the dominant pollutant was PM2.5 and the air quality is super PM2.5 = 32 or 4.44 µg/m³ PM10 = 10 or 10.8 µg/m³ NO₂ = 1 or 1 ppb SO₂ = 4 or 3.21 ppb O₃ = 30 or 32.21 ppb CO = 3 or 0.3 ppb

020

Chicago AQ @chicagoaq.bsky.social · 24/09/2026

At 6 PM the AQI was 30 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 30 or 6.21 µg/m³ PM10 = 15 or 15.7 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 9 or 6.49 ppb O₃ = 26 or 27.92 ppb CO = 2 or 0.2 ppb

011

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 3 PM the AQI was 28 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 28 or 5.95 µg/m³ PM10 = 16 or 16.7 µg/m³ NO₂ = 5 or 5 ppb SO₂ = 11 or 7.59 ppb O₃ = 22 or 23.98 ppb CO = 3 or 0.3 ppb

020

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 12 PM the AQI was 23 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 23 or 6.31 µg/m³ PM10 = 15 or 16.6 µg/m³ NO₂ = 8 or 7 ppb SO₂ = 1 or 1.52 ppb O₃ = 19 or 22.05 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 9 AM the AQI was 23 , the dominant pollutant was PM2.5 and the air quality is unbelievable PM2.5 = 23 or 4.75 µg/m³ PM10 = 15 or 15.7 µg/m³ NO₂ = 9 or 10 ppb SO₂ = 1 or 0.81 ppb O₃ = 21 or 22.87 ppb CO = 2 or 0.2 ppb

031

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 6 AM the AQI was 28 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 26 or 5.01 µg/m³ PM10 = 15 or 15.7 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 1 or 0.82 ppb O₃ = 28 or 29.74 ppb CO = 2 or 0.2 ppb

020

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 9 PM the AQI was 31 , the dominant pollutant was O3 and the air quality is super PM2.5 = 18 or 4.83 µg/m³ PM10 = 12 or 13 µg/m³ NO₂ = 9 or 10 ppb SO₂ = 1 or 1.08 ppb O₃ = 31 or 32.62 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 23/09/2026

At 6 PM the AQI was 27 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 19 or 3.41 µg/m³ PM10 = 9 or 9.6 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 6 or 3.79 ppb O₃ = 27 or 29.23 ppb CO = 1 or 0.1 ppb

000

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 3 PM the AQI was 25 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 22 or 5.69 µg/m³ PM10 = 12 or 12.5 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 9 or 6.25 ppb O₃ = 25 or 27.22 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 12 PM the AQI was 19 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 18 or 2.45 µg/m³ PM10 = 15 or 15.7 µg/m³ NO₂ = 11 or 12 ppb SO₂ = 1 or 1.11 ppb O₃ = 19 or 19.51 ppb CO = 1 or 0.1 ppb

010

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 9 AM the AQI was 19 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 17 or 1.99 µg/m³ PM10 = 6 or 6.9 µg/m³ NO₂ = 6 or 6 ppb SO₂ = 1 or 0.69 ppb O₃ = 19 or 19.62 ppb CO = 2 or 0.2 ppb

031

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 6 AM the AQI was 20 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 15 or 3.59 µg/m³ PM10 = 10 or 11.2 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 1 or 0.65 ppb O₃ = 20 or 22.39 ppb CO = 2 or 0.2 ppb

040

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 9 PM the AQI was 22 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 17 or 2.4 µg/m³ PM10 = 6 or 6.9 µg/m³ NO₂ = 7 or 7 ppb SO₂ = 9 or 6.14 ppb O₃ = 22 or 23.65 ppb CO = 3 or NA ppb

011

Chicago AQ @chicagoaq.bsky.social · 22/09/2026

At 6 PM the AQI was 22 , the dominant pollutant was O3 and the air quality is unbelievable PM2.5 = 18 or 2.35 µg/m³ PM10 = 8 or 8.8 µg/m³ NO₂ = 4 or 4 ppb SO₂ = 4 or 3.17 ppb O₃ = 22 or 23.75 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 21/09/2026

At 3 PM the AQI was 18 , the dominant pollutant was PM2.5 and the air quality is holy PM2.5 = 18 or 4.43 µg/m³ PM10 = 10 or 11 µg/m³ NO₂ = 3 or 3 ppb SO₂ = 1 or 1.34 ppb O₃ = 17 or 18.19 ppb CO = 1 or 0.1 ppb

010

Chicago AQ @chicagoaq.bsky.social · 21/09/2026

At 12 PM the AQI was 17 , the dominant pollutant was PM2.5 and the air quality is holy PM2.5 = 17 or 3.76 µg/m³ PM10 = 12 or 12.8 µg/m³ NO₂ = 8 or 8 ppb SO₂ = 1 or 0.9 ppb O₃ = 11 or 12.07 ppb CO = 2 or 0.2 ppb

000

Chicago AQ @chicagoaq.bsky.social · 21/09/2026

At 9 AM the AQI was 19 , the dominant pollutant was O3 and the air quality is holy PM2.5 = 17 or 4.9 µg/m³ PM10 = 9 or 10.4 µg/m³ NO₂ = 6 or 6 ppb SO₂ = 3 or 2.48 ppb O₃ = 19 or 19.86 ppb CO = 2 or 0.2 ppb

020