| Aurelia, Italy | Good | Details |
| Aurora East, United States (USA) | - | Details |
| AURORA HILLS, United States (USA) | Good | Details |
| Austin North Hills D, United States (USA) | Good | Details |
| Austin North Interst, United States (USA) | Good | Details |
| Austin Webberville R, United States (USA) | Good | Details |
| Avalon, United States (USA) | Good | Details |
| Avon, United States (USA) | - | Details |
| Aydın, Turkey | Good | Details |
| Aydın - Didim, Turkey | Moderate | Details |
| Aydın - Efeler, Turkey | Good | Details |
| Aydın - Germencik, Turkey | Unhealthy for Sensitive Groups | Details |
| Aydın - Nazilli, Turkey | Good | Details |
| Aydın - Söke, Turkey | Good | Details |
| Aydın - Trafik, Turkey | Good | Details |
| Ayia Marina Xyliatou - Background Station, Cyprus | Hazardous | Details |
| AYLESFORD MOUNTAIN, Canada | Good | Details |
| Ayr, Australia | Good | Details |
| Ayutthaya Witthayalai School, Thailand | Good | Details |
| Azalea, United States (USA) | Good | Details |
| A�roport de Montr�al, Canada | - | Details |
| Babylon, United States (USA) | - | Details |
| Backeparken, Norway | Good | Details |
| Badalona, Spain | Good | Details |
| Badhoevedorp-Sloterweg, Netherlands | Moderate | Details |
| Badlands, United States (USA) | Good | Details |
| Bad River Tribal Sch, United States (USA) | Good | Details |
| Bærum Golfklubb, Norway | Good | Details |
| Baker City - Forest, United States (USA) | Good | Details |
| Bakersfield - Califo, United States (USA) | Good | Details |
| Bakersfield - Golden, United States (USA) | Good | Details |
| Bakersfield-Muni, United States (USA) | Good | Details |
| Bakersfield-Westwind, United States (USA) | - | Details |
| Baku, Azerbaijan | Moderate | Details |
| Balfour, South Africa | - | Details |
| Balıkesir, Turkey | Good | Details |
| Balıkesir - Bandırma-MTHM, Turkey | Good | Details |
| Balıkesir - Edremit - MTHM, Turkey | Good | Details |
| Balıkesir - Erdek-MTHM, Turkey | Good | Details |
| Balıkesir - Merkez - MTHM, Turkey | Good | Details |
| Balk-Trophornsterweg, Netherlands | Good | Details |
| Ballymena Ballykeel, United Kingdom (UK) | Good | Details |
| Balneario Curanilahue, Chile | Unhealthy for Sensitive Groups | Details |
| Baltimore County Nea, United States (USA) | - | Details |
| Bang Bon 5 Market, Thailand | Moderate | Details |
| Bang Kapi District Office, Bangkok, Thailand | Moderate | Details |
| Bang Khae District Office, Bangkok, Thailand | Good | Details |
| Bang Khae Phirom Park, Thailand | Good | Details |
| Bang Khen District Office, Bangkok, Thailand | Good | Details |
| Bang Kho Laem District Office, Bangkok (Mobile), Thailand | Good | Details |
| Bang Khun Thian District Office, Bangkok, Thailand | Moderate | Details |
| Bangkok Noi Train Police Station, Thailand | Moderate | Details |
| Bangkok University R, Thailand | Moderate | Details |
| Bangkok University Rangsit Campus, Thailand | Moderate | Details |
| Bangor MSS, United States (USA) | Good | Details |
| Bang Phlat District Office, Bangkok, Thailand | Moderate | Details |
| Bangrak Lovely Plaza, Thailand | Moderate | Details |
| Bang Sue District Office, Bangkok, Thailand | Moderate | Details |
| Bangu, Brazil | Moderate | Details |
| Baniyas School, United Arab Emirates (UAE) | Unhealthy for Sensitive Groups | Details |
| Banja Luka, Bosnia and Herzegovina | Good | Details |
| Bank of Ayuthaya Head Office Yan Nawa, Bangkok, Thailand | Moderate | Details |
| Bankplassen, Norway | Good | Details |
| Banning - South Hath, United States (USA) | Good | Details |
| Ban Padang Community School, Thailand | Good | Details |
| Ban Padang Community School, Thailand | - | Details |
| Bansomdejchaopraya R, Thailand | Good | Details |
| Bansomdejchaopraya Rajabhat University, Thailand | Good | Details |
| Barberà del Vallès, Spain | Good | Details |
| Barcelona, Spain | Very Unhealthy | Details |
| Barcelona, Spain | Good | Details |
| Barcelona, Spain | Good | Details |
| Barcelona, Spain | Good | Details |
| Barcelona, Spain | Good | Details |
| Bar Harbor - Cadilla, United States (USA) | - | Details |
| Barking and Dagenham - Rush Green, United Kingdom (UK) | Good | Details |
| Barking and Dagenham - Scrattons Farm, United Kingdom (UK) | Good | Details |
| Barnsley Gawber, United Kingdom (UK) | Good | Details |
| Barnstaple A39, United Kingdom (UK) | Good | Details |
| BAR-PDLA - Parque de las Aguas, Colombia | - | Details |
| Barrie, Canada | - | Details |
| Barrie, Canada | Good | Details |
| Barsbeek-De Veenen, Netherlands | Good | Details |
| Barstow, United States (USA) | Good | Details |
| Bartın, Turkey | Moderate | Details |
| BAR-TORR - Barbosa - Torre Social, Colombia | Good | Details |
| Basin, United States (USA) | - | Details |
| Bastrop C1612, United States (USA) | - | Details |
| Batavia, United States (USA) | Good | Details |
| BATHURST, Canada | Good | Details |
| Batman, Turkey | Moderate | Details |
| Bayamon 37 (NCore), United States (USA) | - | Details |
| Bayamon 37 (NCore), United States (USA) | - | Details |
| Bayburt, Turkey | Good | Details |
| BAY CITY, United States (USA) | Good | Details |
| Bayonne, United States (USA) | Good | Details |
| Bayou Plaquemine, United States (USA) | - | Details |
| BAYROAD, United States (USA) | - | Details |
| BAYSIDE, United States (USA) | - | Details |
| Baytown C148, United States (USA) | Good | Details |
