When and where does photochemical smog usually occur?

When and where does photochemical smog usually occur?

Photochemical smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere. It is visible as a brown haze, and is most prominent during the morning and afternoon, especially in densely populated, warm cities.

How does photochemical smog occur?

Photochemical smog is produced when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. VOCs are released from gasoline, paints, and many cleaning solvents.

What are the best conditions for photochemical smog?

Warmth, ample sunlight, and a relatively little movement of air so that the reactants are not diluted are also required. The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes).

Which pollutant is the major contributor to photochemical smog?

Ozone
Option 2 is the correct answer: Ozone is the major contributor to photochemical smog.

What causes photochemical smog quizlet?

Photochemical smog is caused by nitrogen oxides combing with sunlight and other pollutants. Acid rain is caused by sulfur oxides and nitrogen oxides combining with water. You just studied 13 terms!

Why Photochemical smog is formed?

Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that is when we have the most sunlight.

Is photochemical smog a primary pollutant?

Photochemical smog is composed of primary and secondary pollutants. Primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. Photochemical smog is most common in sunny and dry cities, like Los Angeles.

What is the major pollutant present in photochemical smog?

Photochemical smog is a brownish-gray haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. It contains anthropogenic air pollutants, mainly ozone, nitric acid, and organic compounds, which are trapped near the ground by temperature inversion.

Why is photochemical smog more prevalent during the summer and early fall than during the middle of winter?

Why is the production of photochemical smog more prevalent during the summer and early fall than during the middle of winter? The production of this smog is more prevalent during the summer because the sunlight is more intense, and sunlight is required to produce ozone.

What creates photochemical smog?

Photochemical smog happens when nitrogen oxides and volatile organic compounds react together in the presence of sunlight as a catalyst and form ozone at lower levels.

What produces photochemical smog?

Photochemical smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere.

What forms photochemical smog?

Primary Pollutants. The first set of pollutants (primary pollutants) are volatile organic compounds (emitted from petroleum combustion,paints,and cleaning solvents) and nitrogen oxides (from car exhausts,coal-fired power plants).

Secondary Pollutants.

(a) Biomass Burning.

(b) Thermal Inversion.

What is photochemical smog composed of?

Photochemical smog requires neither smoke nor fog. It mainly consists of nitrogen dioxide (NO 2), ozone (O 3), peroxyacetyl nitrate (PAN), and organic compounds containing the aldehyde group. What Causes Photochemical Smog and What are the Conditions