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Table 1.

Descriptive statistics.

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Fig 1.

Average weekly straw burning fire points in 2001–2019.

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Fig 2.

National weekly straw burning fire point in 2018 and 2019.

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Table 2.

DID model.

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Table 3.

The influence of straw burning point on PM index in panel regression model.

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Table 4.

The influence of straw burning point on PM index in DID model.

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Fig 3.

Parallel trend test.

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Fig 4.

Upwind and downwind areas.

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Fig 5.

Vector addition of wind.

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Table 5.

The effect of upwind/downwind straw burning on PM2.5 and PM10.

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Fig 6.

Sensitivity test of fire points in different distances in upwind area.

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Table 6.

Regional differences in pollution effects of straw burning.

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Table 7.

Time differences in the pollution effect of straw burning.

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