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在纽约市地铁系统中的颗粒物度和成分

Shams Azad1, David G Luglio2, Terry Gordon2

  • 1Department of Civil and Urban Engineering, New York University, Tandon School of Engineering, Brooklyn, New York, USA.

Atmospheric pollution research
|June 5, 2023
PubMed
概括

纽约市地铁的颗粒物 (PM2.5) 水平在地下明显高于地面. 铁是PM2.5的主要组成部分,这引发了有关当前空气质量标准的问题.

关键词:
空气污染 造成的空气污染暴露 暴露 暴露对于PM2.5来说,这是一个很好的例子.颗粒物质 颗粒物质是什么?地铁地铁地铁地铁地铁

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相关概念视频

Linear Approximations01:23

Linear Approximations

For a differentiable function of two variables, linear approximation estimates values near a known point by replacing the curved surface with its tangent plane. Consider the function\begin{equation*}f(x,y)=x^2+3y^2\end{equation*}near the point (2, 1). The exact value at this point is f(2, 1) = 22 + 3(1)2 = 4 + 3 = 7.The linear approximation of f(x, y)) near (a, b) is\begin{equation*}L(x,y)=f(a,b)+f_x(a,b)(x-a)+f_y(a,b)(y-b)\end{equation*}First, compute the partial derivatives: fx(x, y) = 2x and...