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Situated in the heart of Tarlac province, Capas serves as a vital gateway to the northern reaches of Central Luzon. Geographically, the municipality occupies a strategic position within the vast Tarlac plain, characterized by relatively flat, alluvial terrain that transitions westward into the rugged, forested foothills of the Zambales Mountains. This unique topography creates a funneling effect for prevailing winds, which significantly influences the local airshed. As an urban-rural hybrid, Capas balances a burgeoning residential center with an economy deeply rooted in large-scale agriculture, particularly rice and sugarcane cultivation. The landscape is punctuated by expansive plantations that dictate seasonal land-use patterns, directly impacting particulate matter concentrations. To the east, the sprawling urban corridors of Tarlac City and beyond contribute to a regional haze profile, while the proximity to Mount Pinatubo’s volcanic slopes adds a layer of geological complexity; fine volcanic ash deposits can be re-suspended during high-wind events, occasionally degrading air quality. The urban character is defined by the bustling MacArthur Highway, a major arterial road that acts as a primary conduit for heavy logistics and passenger transport between Manila and the northern provinces. This constant vehicular flux, combined with the agricultural burning practices common in the surrounding hinterlands, creates a localized atmospheric signature. During periods of stagnant air, the combination of regional industrial drift and internal combustion emissions becomes trapped against the mountain backdrop, highlighting the delicate interplay between Capas’s developmental trajectory, its agricultural heritage, and the restrictive influence of the surrounding mountainous terrain on regional air circulation patterns.

Capas experiences a distinct tropical climate governed by the alternating wet and dry seasons, which dictate the rhythm of air quality throughout the year. The dry season, spanning from November to May, represents the period of highest atmospheric concern. During these months, the northeast monsoon brings cooler, drier air, but also facilitates the accumulation of pollutants. Specifically, the post-harvest period from February to April often sees an uptick in fine particulate matter as farmers engage in traditional crop residue burning. These agricultural fires, combined with the lack of significant rainfall to wash pollutants from the atmosphere, can lead to elevated haze levels that linger over the Tarlac plains. Meteorological inversions during cool, clear nights further trap vehicular emissions from the busy MacArthur Highway near the ground. Conversely, the wet season, running from June to October, provides a natural cleansing effect. The southwest monsoon brings heavy, frequent precipitation that effectively scavenges suspended aerosols, leading to a noticeable improvement in air clarity. For those with respiratory sensitivities, the peak dry months of March and April are best approached with caution, as the combination of heat, dust, and agricultural smoke can be challenging. Outdoor activities are most pleasant during the early wet season when temperatures remain moderate and the air is freshest. Sensitive groups should monitor local conditions during the transition from the dry season to the wet season, as shifting wind patterns can occasionally bring concentrated plumes of dust and smoke into the town center, necessitating temporary indoor activity adjustments.