Table 1.
The effect (ATT with 95% CI) of policy on AQCI and six main pollutants in three types of area.
| Treatment period | Pollutant | Core areas | Strictly-regulated areas | Regulated areas |
|---|---|---|---|---|
| Jul–Sep 2016 | AQCI | −17.40* (−24.60, −9.53) | −13.30* (−21.50, −4.23) | −10.09* (−17.51, −2.01) |
| PM2.5 | −18.23* (−28.64, −6.30) | −20.12* (−31.93, −6.25) | −15.46* (−26.21, −3.14) | |
| PM10 | −21.58* (−33.03, −8.18) | −10.34 (−24.47, 6.41) | −12.23 (−24.31, 1.78) | |
| NO2 | −24.51* (−34.47, −13.06) | −12.58 (−27.73, 5.74) | −23.97* (−34.03, −12.37) | |
| SO2 | −17.68 (−37.93, 9.20) | −17.16 (−36.49, 8.05) | −17.49 (−36.00, 6.36) | |
| CO | −10.77 (−21.33, 1.21) | −13.17* (−23.89, −0.93) | −10.76 (−21.30, 1.19) | |
| O3 | −9.94 (−21.15,2.87) | −9.89 (−23.94, 6.77) | −4.35 (−17.16, 10.43) | |
| Jul–Dec 2016 | AQCI | −19.43* (−29.33, −8.13) | −11.68 (−23.99, 2.63) | −14.27* (−24.73, −2.36) |
| PM2.5 | −22.68* (−35.22, −7.71) | −15.87 (−30.62, 2.02) | −19.14* (−32.59, −2.98) | |
| PM10 | −20.26* (−33.26, −4.72) | −4.27 (−24.79, 21.86) | −16.46* (−29.65, −0.80) | |
| NO2 | −18.94* (−31.23, −4.45) | −10.53 (−27.06, 9.75) | −16.44* (−29.71, −0.67) | |
| SO2 | −21.27* (−36.19, −2.85) | −17.65 (−35.22, 4.69) | −14.08 (−29.33, 4.47) | |
| CO | −8.97 (−19.68, 3.17) | −12.55 (−25.23, 2.28) | −6.43 (−17.82, 6.55) | |
| O3 | −9.50 (−22.14, 5.19) | −8.75 (−24.93, 10.90) | 2.36 (−14.79, 22.96) |
*Significant at 5% level.
AQCI, air quality composite index; ATT, average treatment effect on the treated.