Context: Two things happened today in Beijing . First off , incoming journalists were amazed to find China had successfully lifted the brown haze in city . Skies were crystal blue and the air felt noticeably lighter .
Question: Why did the sky appear clearer ?
Option 0: The citizens learned to ignore the gloomy skies .
Option 1: The smog cleared after dangerous chemicals had been removed .
Option 2: None of the above choices .
Option 3: A large storm had recently passed .
Answer: 1