Indoor vs. Outdoor Air Quality: Daily Readings From 3 Sensors (Nov 2023 – Jun 2024)
Daily indoor PM2.5, CO₂, temperature, humidity, and outdoor PM2.5/ozone from 3 sensors over 7 months, showing strong seasonal patterns.
| # | id | date | ind_pm25 | ind_pm10 | ind_co | ind_co2 | ind_temperature | ind_humidity | ind_pressure | out_mean_pm25 | out_mean_o3 | out_max_o3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | QEAYJ3190O | 2023-11-09 | 8.15 | 9.71 | 0.38 | 792.66 | 21.9 | 39.79 | 1000.87 | 13.3 | 6.65 | 22.52 |
| 2 | QKSAX0408B | 2023-11-10 | 5.23 | 5.29 | 0.52 | 948.61 | 18.68 | 51.49 | 990.07 | 11.3 | 20.23 | 39.16 |
| 3 | QEAYJ3190O | 2023-11-10 | 7.18 | 8.49 | 0.4 | 748.06 | 21.67 | 40.53 | 991.14 | 11.3 | 20.23 | 39.16 |
| 4 | QKSAX0408B | 2023-11-11 | 5.76 | 5.77 | 0.58 | 571.8 | 17.17 | 46.6 | 990.44 | 11.5 | 14.9 | 54.49 |
| 5 | QEAYJ3190O | 2023-11-11 | 5.8 | 5.82 | 0.66 | 532.56 | 21.1 | 34.89 | 991.01 | 11.5 | 14.9 | 54.49 |
| 6 | LHDUB4977M | 2023-11-11 | 5.65 | 5.67 | 0.99 | 490.23 | 17.56 | 43.61 | 989.75 | 11.5 | 14.9 | 54.49 |
| 7 | QKSAX0408B | 2023-11-12 | 7.13 | 7.14 | 1.05 | 568.82 | 16.11 | 47.85 | 994.87 | 16.8 | 14.67 | 41.91 |
| 8 | LHDUB4977M | 2023-11-12 | 8.04 | 8.08 | 0.95 | 480.42 | 15.23 | 47.04 | 994.26 | 16.8 | 14.67 | 41.91 |
| 9 | QEAYJ3190O | 2023-11-12 | 10.3 | 10.35 | 0.83 | 523.67 | 17.46 | 40.06 | 995.68 | 16.8 | 14.67 | 41.91 |
| 10 | QKSAX0408B | 2023-11-13 | 12.68 | 12.69 | 1.27 | 1194.69 | 16.88 | 52.66 | 999.79 | 26.3 | 7.12 | 27.95 |
| 11 | QEAYJ3190O | 2023-11-13 | 12.82 | 13.16 | 0.85 | 876 | 20.06 | 41.09 | 1000.54 | 26.3 | 7.12 | 27.95 |
| 12 | LHDUB4977M | 2023-11-13 | 16.59 | 19.92 | 1.2 | 1100.92 | 17.75 | 50.62 | 999.09 | 26.3 | 7.12 | 27.95 |
| 13 | QKSAX0408B | 2023-11-14 | 14.7 | 14.7 | 1.29 | 1144.36 | 18.1 | 55.76 | 997.62 | 33.5 | 3.8 | 6.12 |
| 14 | QEAYJ3190O | 2023-11-14 | 17.32 | 17.67 | 0.74 | 1066.11 | 21.1 | 45.56 | 998.18 | 33.5 | 3.8 | 6.12 |
| 15 | LHDUB4977M | 2023-11-14 | 17.73 | 18.73 | 1.3 | 889.43 | 20.69 | 49.92 | 996.88 | 33.5 | 3.8 | 6.12 |
| 16 | QKSAX0408B | 2023-11-15 | 14 | 14.1 | 1.25 | 1006.66 | 18.97 | 56.65 | 999.59 | 16.6 | 11.02 | 24.73 |
| 17 | LHDUB4977M | 2023-11-15 | 14.23 | 15.51 | 1.24 | 721.32 | 21.84 | 48.92 | 998.43 | 16.6 | 11.02 | 24.73 |
| 18 | QEAYJ3190O | 2023-11-15 | 13.04 | 13.62 | 0.66 | 1028.88 | 21.82 | 45.29 | 1000.08 | 16.6 | 11.02 | 24.73 |
| 19 | QKSAX0408B | 2023-11-16 | 11.13 | 11.28 | 1.14 | 1054.59 | 18.88 | 48.81 | 1000.5 | 21 | 7.81 | 26.15 |
| 20 | QEAYJ3190O | 2023-11-16 | 12.75 | 13.48 | 0.7 | 767.47 | 22.39 | 36.54 | 1000.46 | 21 | 7.81 | 26.15 |
| 21 | LHDUB4977M | 2023-11-16 | 12.52 | 13.8 | 1.31 | 898.51 | 22.18 | 41.9 | 999.12 | 21 | 7.81 | 26.15 |
| 22 | QKSAX0408B | 2023-11-17 | 4.68 | 5.44 | 0.9 | 1025.53 | 18.99 | 42.16 | 998.77 | 11.5 | 37.12 | 74.15 |
| 23 | QEAYJ3190O | 2023-11-17 | 5.42 | 6.65 | 0.72 | 634.14 | 22.4 | 27.97 | 998.58 | 11.5 | 37.12 | 74.15 |
| 24 | LHDUB4977M | 2023-11-17 | 7.04 | 9.56 | 1.13 | 739.82 | 22.17 | 33.28 | 997.19 | 11.5 | 37.12 | 74.15 |
| 25 | QKSAX0408B | 2023-11-18 | 1.47 | 1.47 | 0.77 | 571.94 | 17.61 | 39.45 | 1006.41 | 9.3 | 28.98 | 69.01 |
| 26 | QEAYJ3190O | 2023-11-18 | 2.77 | 2.77 | 0.97 | 513.02 | 21.6 | 26.84 | 1006.5 | 9.3 | 28.98 | 69.01 |
| 27 | LHDUB4977M | 2023-11-18 | 1.19 | 1.19 | 1 | 516.79 | 21.24 | 31.29 | 1005.14 | 9.3 | 28.98 | 69.01 |
| 28 | QKSAX0408B | 2023-11-19 | 7.05 | 7.05 | 0.85 | 565.91 | 16.65 | 43.53 | 1003.58 | 27.7 | 11.52 | 48.61 |
| 29 | QEAYJ3190O | 2023-11-19 | 11.47 | 11.47 | 0.89 | 539.14 | 17.87 | 35.98 | 1003.45 | 27.7 | 11.52 | 48.61 |
| 30 | LHDUB4977M | 2023-11-19 | 5.71 | 5.71 | 1.15 | 563.22 | 20.16 | 35.71 | 1002.1 | 27.7 | 11.52 | 48.61 |
| 31 | QKSAX0408B | 2023-11-20 | 18.13 | 18.14 | 0.97 | 982.03 | 18.64 | 45.86 | 998.52 | 38.1 | 4.9 | 14.91 |
| 32 | LHDUB4977M | 2023-11-20 | 15.04 | 15.31 | 1.21 | 995.52 | 20.93 | 40.46 | 997.28 | 38.1 | 4.9 | 14.91 |
| 33 | QEAYJ3190O | 2023-11-20 | 19.07 | 19.2 | 0.93 | 838.16 | 20.26 | 38.35 | 998.64 | 38.1 | 4.9 | 14.91 |
| 34 | QKSAX0408B | 2023-11-21 | 20.47 | 20.55 | 0.85 | 966.71 | 18.77 | 48.98 | 993.86 | 30.1 | 17.7 | 39.84 |
| 35 | QEAYJ3190O | 2023-11-21 | 17.56 | 17.76 | 0.9 | 736.86 | 21.41 | 39.04 | 993.99 | 30.1 | 17.7 | 39.84 |
| 36 | LHDUB4977M | 2023-11-21 | 17.03 | 17.3 | 1.13 | 791.65 | 21.8 | 40.49 | 992.58 | 30.1 | 17.7 | 39.84 |
| 37 | QKSAX0408B | 2023-11-22 | 8.47 | 8.74 | 0.92 | 987.68 | 18.89 | 46.21 | 1000.57 | 17 | 13.38 | 49.27 |
| 38 | QEAYJ3190O | 2023-11-22 | 10.55 | 11.13 | 0.98 | 751.13 | 21.52 | 35.08 | 1000.63 | 17 | 13.38 | 49.27 |
| 39 | LHDUB4977M | 2023-11-22 | 8.42 | 9.96 | 1.27 | 836.84 | 22.38 | 38.11 | 999.31 | 17 | 13.38 | 49.27 |
| 40 | QKSAX0408B | 2023-11-23 | 9.41 | 9.52 | 0.99 | 968.25 | 18.8 | 44.39 | 1005.02 | 21.2 | 8 | 26.68 |
| 41 | LHDUB4977M | 2023-11-23 | 10.68 | 12.34 | 1.35 | 823.15 | 22.51 | 36.36 | 1003.51 | 21.2 | 8 | 26.68 |
| 42 | QEAYJ3190O | 2023-11-23 | 12.85 | 13.12 | 1.02 | 691.14 | 21.12 | 33.81 | 1004.84 | 21.2 | 8 | 26.68 |
| 43 | QKSAX0408B | 2023-11-24 | 9.72 | 9.79 | 0.93 | 925.55 | 18.74 | 41.86 | 987.75 | 24.2 | 16.2 | 83.38 |
| 44 | QEAYJ3190O | 2023-11-24 | 12.11 | 12.39 | 1.02 | 659.66 | 20.42 | 32.47 | 987.73 | 24.2 | 16.2 | 83.38 |
| 45 | LHDUB4977M | 2023-11-24 | 11.92 | 12.71 | 1.36 | 868.49 | 22.32 | 35.85 | 986.42 | 24.2 | 16.2 | 83.38 |
| 46 | QKSAX0408B | 2023-11-25 | 1.08 | 1.14 | 1.07 | 491.99 | 17.03 | 29.73 | 992.02 | 3.1 | 61.02 | 82.2 |
| 47 | QEAYJ3190O | 2023-11-25 | 1.09 | 1.11 | 0.93 | 378.99 | 19.34 | 17.88 | 991.97 | 3.1 | 61.02 | 82.2 |
| 48 | LHDUB4977M | 2023-11-25 | 0.56 | 0.57 | 0.94 | 385.83 | 20.61 | 21.82 | 990.65 | 3.1 | 61.02 | 82.2 |
| 49 | QKSAX0408B | 2023-11-26 | 2.28 | 2.28 | 1.12 | 457.25 | 15.63 | 30.48 | 996.53 | 6.7 | 36.72 | 74.32 |
| 50 | LHDUB4977M | 2023-11-26 | 1.94 | 1.94 | 0.96 | 401.93 | 18.73 | 23.85 | 995.22 | 6.7 | 36.72 | 74.32 |
| 51 | QEAYJ3190O | 2023-11-26 | 3.24 | 3.25 | 1.02 | 399.69 | 18.79 | 20.39 | 996.54 | 6.7 | 36.72 | 74.32 |
| 52 | QKSAX0408B | 2023-11-27 | 7.25 | 7.31 | 1.21 | 918.98 | 17.21 | 35.35 | 994.01 | 15.9 | 7.91 | 22.45 |
| 53 | QEAYJ3190O | 2023-11-27 | 8.81 | 9.17 | 1.1 | 690.78 | 19.86 | 27.13 | 993.66 | 15.9 | 7.91 | 22.45 |
| 54 | LHDUB4977M | 2023-11-27 | 7.13 | 7.94 | 1.06 | 1032.79 | 19.59 | 32.28 | 992.8 | 15.9 | 7.91 | 22.45 |
| 55 | QKSAX0408B | 2023-11-28 | 10.11 | 10.24 | 1.19 | 946.66 | 18.31 | 38.6 | 982.09 | 17.6 | 19.49 | 53.61 |
| 56 | QEAYJ3190O | 2023-11-28 | 12.39 | 12.68 | 1.08 | 621.34 | 19.88 | 30.45 | 981.79 | 17.6 | 19.49 | 53.61 |
| 57 | LHDUB4977M | 2023-11-28 | 11.41 | 12.4 | 1.18 | 740.96 | 19.86 | 34.12 | 981.29 | 17.6 | 19.49 | 53.61 |
| 58 | QKSAX0408B | 2023-11-29 | 5.38 | 5.51 | 1.23 | 1041.42 | 18.27 | 33.62 | 991.06 | 11.7 | 24.48 | 62.48 |
| 59 | QEAYJ3190O | 2023-11-29 | 7.16 | 7.78 | 1.14 | 685.96 | 20.47 | 25.16 | 991.05 | 11.7 | 24.48 | 62.48 |
| 60 | LHDUB4977M | 2023-11-29 | 6.79 | 8.03 | 1.1 | 799.41 | 20.31 | 29.61 | 989.6 | 11.7 | 24.48 | 62.48 |
| 61 | QKSAX0408B | 2023-11-30 | 8.29 | 8.38 | 1.2 | 947.16 | 18.64 | 40.03 | 989.91 | 14.7 | 10.97 | 22.44 |
| 62 | LHDUB4977M | 2023-11-30 | 10.41 | 11.3 | 1.13 | 862.62 | 20.43 | 36.45 | 988.41 | 14.7 | 10.97 | 22.44 |
| 63 | QEAYJ3190O | 2023-11-30 | 9.65 | 10.16 | 1.11 | 691.28 | 20.71 | 32.31 | 989.87 | 14.7 | 10.97 | 22.44 |
| 64 | QKSAX0408B | 2023-12-01 | 11.14 | 11.28 | 1.18 | 946.29 | 18.67 | 43.87 | 982.15 | 14.8 | 6.68 | 21.91 |
| 65 | QEAYJ3190O | 2023-12-01 | 10.75 | 11.03 | 1.13 | 648.82 | 20.71 | 35.31 | 982.62 | 14.8 | 6.68 | 21.91 |
| 66 | LHDUB4977M | 2023-12-01 | 14.18 | 15.22 | 1.15 | 755.23 | 19.67 | 40.26 | 981.23 | 14.8 | 6.68 | 21.91 |
| 67 | QKSAX0408B | 2023-12-02 | 4.8 | 4.92 | 1.07 | 585.23 | 18.19 | 38.99 | 981.62 | 6.4 | 1.99 | 2.39 |
| 68 | QEAYJ3190O | 2023-12-02 | 3.85 | 3.88 | 1.06 | 422.64 | 19.6 | 27.44 | 981.76 | 6.4 | 1.99 | 2.39 |
| 69 | LHDUB4977M | 2023-12-02 | 3.94 | 3.98 | 1.1 | 402.84 | 19.44 | 32.08 | 980.42 | 6.4 | 1.99 | 2.39 |
| 70 | QKSAX0408B | 2023-12-03 | 2.05 | 2.05 | 1.17 | 488.48 | 16.8 | 34.47 | 1004.2 | 8.6 | ||
| 71 | QEAYJ3190O | 2023-12-03 | 3.09 | 3.09 | 1.22 | 429.78 | 19.6 | 24.5 | 1004.12 | 8.6 | ||
| 72 | LHDUB4977M | 2023-12-03 | 2.22 | 2.22 | 1 | 370.2 | 17.65 | 29.26 | 1002.93 | 8.6 | ||
| 73 | QKSAX0408B | 2023-12-04 | 7.9 | 7.98 | 1.25 | 942.59 | 18.14 | 36.45 | 1005.21 | 16.6 | 8.01 | 22.07 |
| 74 | QEAYJ3190O | 2023-12-04 | 8.86 | 9.06 | 1.22 | 706.45 | 21.04 | 26.95 | 1005.52 | 16.6 | 8.01 | 22.07 |
| 75 | LHDUB4977M | 2023-12-04 | 12.23 | 14.28 | 1.14 | 954.53 | 18.14 | 35.69 | 1004.05 | 16.6 | 8.01 | 22.07 |
| 76 | QKSAX0408B | 2023-12-05 | 14.3 | 14.44 | 1.31 | 867.05 | 18.03 | 38.15 | 997.17 | 22 | 8.04 | 24.12 |
| 77 | LHDUB4977M | 2023-12-05 | 16.98 | 18.78 | 1.13 | 929.29 | 18.16 | 38.54 | 996.16 | 22 | 8.04 | 24.12 |
| 78 | QEAYJ3190O | 2023-12-05 | 15.93 | 16.09 | 1.32 | 682.7 | 20.12 | 30.08 | 997.5 | 22 | 8.04 | 24.12 |
| 79 | QKSAX0408B | 2023-12-06 | 15.52 | 15.56 | 1.3 | 949.38 | 17.98 | 37.79 | 997.32 | 32.4 | 5.76 | 15.55 |
| 80 | QEAYJ3190O | 2023-12-06 | 18.93 | 19.13 | 1.46 | 749.97 | 19.86 | 29.55 | 997.58 | 32.4 | 5.76 | 15.55 |
| 81 | LHDUB4977M | 2023-12-06 | 18.39 | 20.15 | 1.43 | 894.65 | 18.55 | 36.98 | 996.37 | 32.4 | 5.76 | 15.55 |
| 82 | QKSAX0408B | 2023-12-07 | 20.01 | 20.01 | 1.76 | 632.99 | 15.69 | 37.91 | 1003.29 | 44.1 | 5.09 | 13.89 |
| 83 | LHDUB4977M | 2023-12-07 | 17.18 | 17.18 | 1.93 | 550.43 | 17.65 | 33.33 | 1001.65 | 44.1 | 5.09 | 13.89 |
| 84 | QEAYJ3190O | 2023-12-07 | 22.29 | 22.29 | 1.48 | 561.27 | 19.02 | 27.36 | 1003.16 | 44.1 | 5.09 | 13.89 |
| 85 | QKSAX0408B | 2023-12-08 | 9.76 | 9.76 | 1.42 | 498.38 | 14.17 | 40.64 | 1001.48 | 19.3 | 12.86 | 35.4 |
| 86 | QEAYJ3190O | 2023-12-08 | 11.91 | 11.91 | 0.98 | 466.1 | 18.79 | 30.22 | 1001.47 | 19.3 | 12.86 | 35.4 |
| 87 | QKSAX0408B | 2023-12-09 | 13.27 | 13.45 | 1.21 | 443.36 | 12.96 | 44.74 | 1001.18 | 20.4 | 10.77 | 19.68 |
| 88 | QEAYJ3190O | 2023-12-09 | 13.43 | 13.58 | 0.64 | 414.88 | 18.65 | 32.16 | 1001.08 | 20.4 | 10.77 | 19.68 |
| 89 | QKSAX0408B | 2023-12-10 | 10.87 | 10.94 | 1.24 | 457.64 | 13.31 | 46.32 | 999.81 | 18 | 10.15 | 19.01 |
| 90 | QEAYJ3190O | 2023-12-10 | 10.54 | 10.59 | 0.69 | 435.18 | 19.82 | 32.59 | 999.98 | 18 | 10.15 | 19.01 |
| 91 | QKSAX0408B | 2023-12-11 | 18.09 | 18.24 | 1.4 | 1016.62 | 16.16 | 49.32 | 997.98 | 27.4 | 4.76 | 13.02 |
| 92 | QEAYJ3190O | 2023-12-11 | 19.79 | 20.16 | 0.79 | 709.34 | 21.65 | 34.32 | 998.06 | 27.4 | 4.76 | 13.02 |
| 93 | QKSAX0408B | 2023-12-12 | 21.95 | 22.26 | 1.59 | 950.78 | 17.86 | 46.26 | 996.07 | 31.2 | 3.58 | 8.1 |
| 94 | QEAYJ3190O | 2023-12-12 | 23.72 | 24.19 | 0.98 | 699.54 | 21.12 | 34.92 | 996.43 | 31.2 | 3.58 | 8.1 |
| 95 | QKSAX0408B | 2023-12-13 | 17.08 | 17.28 | 1.55 | 976.13 | 19.11 | 47.33 | 987.06 | 22.1 | 3.09 | 5.76 |
| 96 | QEAYJ3190O | 2023-12-13 | 19.36 | 19.94 | 1.01 | 662.93 | 21.39 | 37.92 | 987.32 | 22.1 | 3.09 | 5.76 |
| 97 | QKSAX0408B | 2023-12-14 | 17.12 | 17.24 | 1.48 | 925.72 | 19.44 | 46.28 | 996.53 | 29.2 | 5.51 | 12.24 |
| 98 | QEAYJ3190O | 2023-12-14 | 19.63 | 19.96 | 1.02 | 643.89 | 21.48 | 36.19 | 997.18 | 29.2 | 5.51 | 12.24 |
| 99 | LHDUB4977M | 2023-12-14 | 19.14 | 19.78 | 1.65 | 823.95 | 21.53 | 40.43 | 998.86 | 29.2 | 5.51 | 12.24 |
| 100 | QKSAX0408B | 2023-12-15 | 16.4 | 16.46 | 1.66 | 1040.57 | 19.67 | 43.2 | 1011.83 | 35.5 | 7.48 | 12.04 |
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Indoor vs. Outdoor Air Quality: Daily Readings From 3 Sensors (Nov 2023 – Jun 2024) — Analysis
About this dataset
This longitudinal dataset from Zenodo (record #17288578) tracks daily indoor and outdoor air quality across 3 sensor locations from November 2023 through June 2024, capturing 627 readings across 12 variables — including PM2.5, PM10, CO, CO₂, ozone, temperature, humidity, and pressure — all collected in homes equipped with air purifiers. The most striking finding is how tightly indoor particulate matter tracks outdoor pollution despite active filtration: indoor and outdoor PM2.5 are strongly correlated (r²=0.85), and on the worst days outdoor PM2.5 spiked to 83 μg/m³ while indoor PM2.5 peaked at 49 μg/m³ — nearly double the WHO 24-hour guideline of 15 μg/m³. On typical days, purifiers do their job — median indoor PM2.5 is 6.83 μg/m³ versus 14 μg/m³ outdoors — but 12 anomalous high-pollution events broke through that buffer, showing that purifiers reduce rather than eliminate outdoor air quality crises. Indoor CO₂ averaging 682 ppm (median 659 ppm, peaking near 1,000 ppm) reveals periods of limited ventilation that compound pollution exposure. Together these patterns make this dataset a valuable resource for researchers evaluating residential air purification effectiveness under real-world, multi-season conditions.
Key Findings
- Indoor and outdoor PM2.5 are 92% correlated — outdoor air quality almost entirely dictates indoor levels
- Ozone follows the opposite seasonal pattern: mean O₃ surged from 9.9 µg/m³ in December to 64.2 in May (a 6.5× increase)
- Indoor CO₂ peaked at 799 ppm in January and dropped to 520 ppm by June, suggesting improved ventilation in warmer months
- Sensor QKSAX0408B recorded 20% higher average CO₂ (739 ppm) than QEAYJ3190O (614 ppm), likely indicating a less-ventilated room
Visualizations
Average CO₂ by Sensor Location
Indoor CO₂ Concentration by Month
Outdoor Ozone Levels by Month
Indoor vs. Outdoor PM2.5 by Month