Yizheng chemical industry park has no smell during the day.

Yizheng Chemical Industry Park has no smell during the day for the following reasons:

1. Wind direction change: The wind direction around Yizheng Chemical Industry Park may have changed during the day, which makes the direction of waste gas emission separate from the surrounding environment, thus reducing the spread and influence of harmful gases.

2. Environmental protection measures: Yizheng Chemical Industry Park may have adopted stricter environmental protection measures, such as strengthening the supervision and management of waste gas treatment equipment and process facilities, controlling the concentration and emission of waste gas and reducing the release of harmful gases.

3. Meteorological conditions: Meteorological conditions around Yizheng Chemical Industry Park may affect the diffusion and spread of waste gas, such as wind speed, temperature and humidity. If the weather conditions are not conducive to the diffusion of waste gas, harmful gases may gather together to form a pungent smell.