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Pattaya occupies a distinctive coastal position along Thailand's eastern Gulf shoreline in Chon Buri province, situated approximately 150 kilometers southeast of Bangkok within Southeast Asia's tropical corridor. This resort city sprawls across a narrow coastal plain backed by low hills, with elevations generally below 50 meters, creating a compressed urban-rural gradient where dense tourism infrastructure abruptly transitions to agricultural hinterlands. Pattaya's geography fundamentally shapes its air quality challenges: the city curves around a sheltered bay that traps emissions from marine vessels and tour buses, while its location between the Gulf of Thailand and inland agricultural zones exposes it to multiple pollution sources. The surrounding landscape includes mixed-use areas with pineapple plantations and light industry to the north, while the urban core concentrates along Beach Road with high-rise developments. This coastal basin setting, combined with proximity to Thailand's Eastern Economic Corridor industrial belt, creates a complex airshed where sea breezes intermittently disperse pollutants but thermal inversions frequently develop over the low-lying terrain. The city's rapid expansion has consumed former agricultural land, creating persistent construction dust, while its position as a tourism gateway ensures continuous vehicle emissions along congested corridors connecting to Bangkok and industrial zones.

Pattaya's tropical wet-and-dry climate creates distinct seasonal air quality patterns that directly impact visitor health and activity planning. During the peak pollution months of January through March, the northeast monsoon brings dry continental air from mainland Asia, combining with frequent temperature inversions that trap vehicle exhaust, construction dust, and generator emissions at street level. These months experience minimal rainfall and stagnant atmospheric conditions, making them particularly hazardous for outdoor exercise, especially for those with respiratory conditions. The transitional period of April to June sees increasing heat and humidity, which can elevate ozone formation from vehicle emissions, though occasional thunderstorms provide temporary cleansing. From July to October, the southwest monsoon delivers substantial rainfall that scrubs particulate matter from the air, creating the cleanest conditions despite high humidity and tropical storm risks. November and December mark another transition with improving air quality as seasonal winds shift. Sensitive groups including children, elderly visitors, and those with asthma should avoid prolonged outdoor exposure during morning hours in peak season when inversion layers are strongest, and monitor local air quality advisories particularly when planning beach activities or temple visits in the urban core.