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Pasig City occupies a strategic position within Metro Manila's eastern corridor, situated along the banks of the Pasig River which bisects the city and historically served as a vital transportation artery connecting Manila Bay to Laguna de Bay. This riverine geography places Pasig at approximately 15 meters above sea level on the flat alluvial plains of the Marikina Valley, creating a basin-like topography that traps air pollutants. As part of the National Capital Region, Pasig is completely urbanized with dense commercial and residential development, transitioning abruptly from Manila's central business districts to its east without significant rural buffers. The city lies immediately adjacent to Quezon City to the north and Makati to the southwest, forming part of Metro Manila's continuous urban sprawl that stretches across the coastal plain. Pasig's location within this megacity's industrial belt—particularly along the Ortigas Center business district and numerous manufacturing zones—generates substantial vehicular and industrial emissions. The city's proximity to both Manila Bay (approximately 10 kilometers west) and Laguna de Bay (approximately 8 kilometers southeast) creates complex microclimates where sea breezes occasionally disperse pollutants but temperature inversions frequently develop in the valley. This urban geography, combined with limited green spaces and high building density, creates persistent air quality challenges as emissions accumulate in the topographic bowl formed by surrounding higher elevations.

Pasig City experiences distinct seasonal air quality patterns shaped by the Philippines' tropical monsoon climate. During the dry season from January to May, pollution typically peaks as stable atmospheric conditions, limited rainfall, and frequent temperature inversions trap vehicular and industrial emissions in the urban basin. February through April often represent the most challenging months, with hot temperatures and light winds allowing particulate matter to accumulate to concerning levels. Sensitive groups should minimize outdoor exertion during afternoon hours when ozone formation peaks. The transition to the rainy season in June brings relief as southwest monsoon rains effectively wash pollutants from the atmosphere, with July through September generally offering the cleanest air despite occasional urban flooding. However, this period also sees increased humidity that can exacerbate respiratory discomfort. From October to December, the northeast monsoon introduces cooler, drier air that initially improves visibility but can lead to pollution buildup during extended dry spells. Throughout the year, morning traffic congestion creates daily pollution spikes, while industrial emissions from nearby Valenzuela and Caloocan factories can drift into Pasig under prevailing wind patterns. Residents with respiratory conditions should monitor daily air quality reports, use air purifiers during peak pollution periods, and schedule outdoor activities for early mornings after overnight atmospheric mixing has occurred.