"Air quality improvement" . "carried many hundreds of kilometres by winds" . "Airborne pollutants" . "dangerous gases for citizens" . "Air Pollution" . . "atmospherical pollution" . "Atmospheric pollution monitoring" . . . . "Cleaner air" . . "particulate pollution" . . . . "Air pollution" . "unsanitary" . "monitoring of air pollution" . "Air_pollution" . "Air pollution#Central nervous system" . . . "emission of pollutants" . "poor air quality" . "polluted" . . . "pollutants" . "airborne pollutants" . "air toxics" . "pollution levels" . "petrol fumes" . "environment" . . "cost of air pollution to society" . . . "Air_pollution#Regulations" . . "Air pollution#Reduction and regulation" . . "emissions to air" . "Outdoor air pollutants" . "Air quality" . "polluting the atmosphere" . "air contaminants" . . . . . . "Air_pollution#Lung_disease" . "pollution" . . . "Air pollution control" . . . . "air quality limit values" . . "clean-air groups" . "polluted air" . "quality of air" . . . . . "Air quality monitoring" . "Air_pollution#Economic_effects" . "air pollutants" . . . . "outdoor and indoor air pollution" . "smoke pollution" . . "impurities" . "Air pollution#Health effects" . "emission reduction controls" . . . "pollutes the air" . "industrial emissions" . . "Air pollution" . "atmospheric pollution" . "Air_pollution#Health_effects" . "Air_pollution#Agricultural_effects" . "airborne pollution" . "air pollution#Indoor air quality" . . "pollutant" . "environmental emissions" . . "Industrial pollution" . "atmosphere emissions" . "particle pollution" . "Air_pollution#Central_nervous_system" . "Air Pollution Control" . "air particulates" . "air pollution" . "toxic aerial compounds" . "pollutants in the air" . . . "particulate pollutants" . "massive clouds of smoke and ash" . "Ordinance on Air Pollution" . "air pollution agency" . "Air pollution sensor" . "local pollutant" . "Air" . . "air" . "pollution of air" . . . "air quality" . "Pollutants" . "outdoor pollution" . "Air_pollution#Prenatal_exposure" . "particulate" . "Air pollution#Most polluted cities" . "emission" . "air emissions" . "emissions reductions" . . . "polluting emission" . . . "SOx and NOx" . "Air pollutants" . . "pollution in the air" . . . "vehicle emissions pollution" . "atmospheric" . . . . "Air Quality" . "outside" . . "polluting" . "Air_pollution#Control_devices" . . . "air-polluted" . "air pollutant" . "fumes" . . "Emissions" . "polluted city" . "emissions" . "Air pollution#Cities" . "reductions in the intelligence" . . "vehicle emissions" . "air contamination" . "outdoor air pollution" . . "Outdoor air pollution" . "traffic emissions" . "atmospheric pollutants" . "pollutant emissions into the atmosphere" . "emission reduction" . "air pollution emission" . "Air_pollution#Monitoring" . "Emission" . . "Metallic particles from human sources" . . "medical effects of air pollution" . . . . "pollution of the atmosphere" . "environmental concerns about air pollution" . "air-polluting" . . "reduction of pollution" . . "Industrial Air Pollution" . "human health impacts" . "exhaust emissions" . . "polluted atmosphere" . "Air_pollution#Cardiovascular_disease" . . "emissions control" . . "Pollution" . "cleaner air" . . . . . "atmospheric contaminants" . . "Health effects of air pollution" . . "primary and secondary pollutants" . "good air" . . "health effects" . "Air_pollution#Historical_disasters" . "Air_pollution#Alternatives_to_pollution" . . . . . "atmospheric emissions" . "Environmental Pollution" . "air polluter" . "clean air" . . "emission levels" . "atmosphere" . . "pollution control equipment" . . . "pollute the air" . . "control emissions" . . "atmospheric aerosol loading" .