报告称有些地区一年有200天是烟雾天气。
Some areas reportedly were shrouded in smog for 200 days during the year.
光学厚度小于0.1意味着是能见度高的晴天；1或者以上则意味着烟雾天气。
An optical thickness of less than 0.1 indicates a clear sky with maximum visibility; a value of 1 or above indicates very hazy conditions.
对于因严重暴露在烟雾天气中而造成的死亡情况，短期研究所得的结果含混不清。
But short - term studies of death from acute exposure on smoggy days have yielded mixed results.
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