我想创建一个如图所示的表格。我使用了以下代码 \usepackage{tabulary}
\begin{文档} \begin{表格}{\linewidth}{LCL}
Pollutant & Description and sources & Health and environment effects \\
\hline
SO$_2$ & SO$_2$ is formed by oxidation of sulphur (S), mainly through combustion of fuels containing S. The electricity generation sector is the most important source of SO$_2$. SO$_2$ also can contribute to the formation of secondary sulphate particles in the atmosphere. & SO$_2$ aggravates asthma and can reduce lung function and inflame the respiratory tract. It can cause headache, general discomfort and anxiety. SO$_2$ contributes to acid deposition, the impacts of which can be significant, causing damage to forests and ecosystems in rivers and lakes. \\
\hline
Nitrogen oxides (NO$_x$). & NO$_x$ is emitted during fuel combustion e.g. from industrial facilities and the road transport sector. NO$_x$ is a group of gases comprising nitrogen monoxide (NO) and nitrogen dioxide (NO$_2$). NO makes up the majority of NO$_x$ emissions. NO$_x$ contributes to the formation of ozone and particulate matter. & NO$_2$ is associated with adverse effects on health: it can affect the liver, lung, spleen and blood. It can also aggravate lung diseases leading to respiratory symptoms and increased susceptibility to respiratory infection. As with SO$_2$, NO$_x$ contributes to acid deposition but also to eutrophication of soil and water. \\
\hline
\end{表格} \end{文档}
上面的命令看起来不太好。我应该怎么做才能使它看起来更像图片中的那个。