A brownish haze produced when nitrogen compounds and other pollutants react in the presence of sunlight is known as what?

A brownish haze produced when nitrogen compounds and other pollutants react in the presence of sunlight is known as what?

• A. A white fog from atmospheric moisture
• B. Photochemical smog
• C. A dense dust cloud
• D. A rainstorm with pollutants

Answer: (B)

Photochemical smog forms when pollutants like nitrogen oxides from vehicle exhaust react with volatile organic compounds in the presence of sunlight. These sunlight-driven reactions create secondary pollutants such as ozone and other oxidants, giving the air a brownish haze, especially on sunny, warm days with little air movement. The other descriptions describe different phenomena: white fog from atmospheric moisture is just humid air condensing; a dense dust cloud is windblown dust; a rainstorm with pollutants refers to polluted precipitation, not a haze created by sunlight-driven chemistry.

Photochemical smog forms when pollutants like nitrogen oxides from vehicle exhaust react with volatile organic compounds in the presence of sunlight. These sunlight-driven reactions create secondary pollutants such as ozone and other oxidants, giving the air a brownish haze, especially on sunny, warm days with little air movement. The other descriptions describe different phenomena: white fog from atmospheric moisture is just humid air condensing; a dense dust cloud is windblown dust; a rainstorm with pollutants refers to polluted precipitation, not a haze created by sunlight-driven chemistry.