Table 1.
Average of all AirNow site hourly (MDA8) O3 changes in ppb for the 2020 COVID-19 economic slowdown periods compared to the previous five years (2015–2019).
| Period | 2020–2019 | 2020–2018 | 2020–2017 | 2020–2016 | 2020–2015 | Average |
|---|---|---|---|---|---|---|
| Mar 15-Apr 15 | −4.3 (−5.8) | −3.8 (−4.4) | −3.4 (−4.7) | −1.9 (−2.6) | −1.1 (−2.2) | −2.9 (-3.9) |
| Apr 15-May 15 | +1.1 (+0.8) | −3.0 (−4.2) | +0.3 (−0.3) | +0.4 (−0.7) | −0.4 (−2.0) | −0.3 (-1.3) |
| May 15-Jun 15 | −1.9 (−2.5) | −1.5 (−2.9) | −2.3 (−3.4) | −2.4 (−4.0) | −1.5 (−2.2) | −1.9 (-3.0) |
| Jun 15-Jul 15 | −0.6 (−0.6) | −1.6 (−2.0) | −0.7 (−0.7) | −2.1 (−2.5) | +0.2 (+0.4) | −1.0 (-1.1) |
| Jul 15-Aug 15 | −1.6 (−2.4) | −2.4 (−3.7) | −1.0 (−1.9) | −1.3 (−2.0) | −1.0 (−2.0) | −1.5 (-2.4) |
| Aug 15- Sep 15 | −1.4 (−1.8) | −0.6 (−0.4) | −1.7 (−2.3) | −0.5 (−0.7) | −3.0 (−4.6) | −1.4 (-2.0) |
Increases are shaded in red and decreases are shaded in blue.