smog

noun 0.762

photochemical

noun 0.701

photochemical reaction

noun 0.672

photochemistry

noun 0.610

air pollution

noun 0.610

air pollutant

noun 0.581

brown cloud

noun 0.579

dirty weather

noun 0.562

photooxidation

noun 0.556

haze

noun 0.538

ozone

noun 0.538

acid rain

noun 0.536

sulfur dioxide

noun 0.532

ground fog

noun 0.521

sulfur oxide

noun 0.517

fog

noun 0.515

nitrogen oxide

noun 0.513

nitrogen dioxide

noun 0.512

ice fog

noun 0.510

photooxygenation

noun 0.509

photochromism

noun 0.502