You'd see a cloud of photochemical smog covering the planet.

你会看一团烟雾笼罩着地球。

Both are key ingredients in photochemical smog, which is what had been plaguing LA.

两者都是烟雾的关键成分，这是一直困扰洛杉矶的原因。

Both industrial and photochemical smog combine manmade pollution with local weather and geography.

工业烟雾和烟雾都将人为污染与当地的天气和地理因素结合在一起。

Photochemical smog is strongest in urban areas with calm winds and dry, warm, sunny weather.

烟雾在城市地区最强， 风平缓，天气干燥、温暖、阳明媚。

Secondary pollutants found in photochemical smog can damage and weaken crops and decrease yield, making them more susceptible to insects.

烟雾中发现的二次污染物会破坏和削弱农作物并降低产量，使它们更容易受昆虫的侵害。

Photochemical smog and airborne particles from vehicle emissions affect many rapidly developing cities, from Mexico City and Santiago to New Delhi and Tehran.

车辆排放的烟雾和空气中的颗粒物影响着许多快速发展的城市，从墨西哥城和圣地亚哥德里和德黑兰。

And while some ozone in the upper atmosphere helps shield us from ultraviolet rays, on the ground, this gas can form alongside secondary particles and create photochemical smog.

它们会发生反应，形成臭氧。虽然高层大气中的臭氧能帮我们阻挡紫外线，在地面，这类气体可能会和衍生性粒子一起形成，产生烟雾。

It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.

这听起来很矛盾，因为这个假设背后的想法是，红色素是在秋天的树叶中产生的，以保护叶绿素，一种吸物质，免受过多线的影响。

Other researchers have also found some superacids that bond really well with nitrogen oxides, gases made of both nitrogen and oxygen that are released in car exhaust, become smog, and lead to acid rain.

另一些研究人员还发现一些超强酸与氮氧物结合的很好，汽车排放的含氮和氧组成的尾气会造成烟雾污染，进一步形成酸雨。

First, we must verify the detection of phosphine itself, and then later, we would have to confirm that this gas is coming from life and not from some unexpected geological or photochemical process.

首先，我们必须验证磷氢本身的检测，然后我们必须确认这种气体来自生命，而不是来自一些意想不的地质或过程。