Background of the Study
Background of the Study
Air pollution remains one of the most serious environmental problems affecting human health worldwide. Among the various air pollutants, particulate matter P M two point five and P M ten is considered especially harmful because it can enter the respiratory system, and in the case of P M two point five which can reach the bloodstream. P M ten mainly affects the upper airway, while P M two point five being much finer can penetrate deep into the lungs and increase the risk of respiratory illness, cardiovascular disease, and premature death. Children are considered particularly vulnerable to particulate matter exposure, because their respiratory systems are still developing and they breathe at a faster rate relative to their body size. Consequently, monitoring P M two point five and P M ten concentrations has become an essential component of environmental protection, and public health programs.
Globally, studies have identified traffic volume, population density, and the presence of pollution sources such as roads, vehicles, and commercial establishments as major factors influencing particulate matter concentrations. Han and Sun, in a study conducted in Shanghai, China, found that population density was positively associated with P M two point five concentrations, because densely populated areas tend to concentrate traffic congestion, and pollution sources within a smaller space. Similarly, Tseng et al. reported that vehicular traffic and other anthropogenic emission sources were major contributors to elevated P M two point five concentrations, while Castilla et al.
found that commercial and high-traffic areas consistently exhibited higher P M two point five and P M ten concentrations than residential areas. Together, these studies demonstrate that areas characterized by high population density, heavy traffic, and concentrated commercial activities are more likely to experience elevated particulate matter concentrations regardless of geographic location.
In the Philippines, similar patterns have been observed. Pabroa et al. examined ambient particulate matter from multiple air quality monitoring stations in Metro Manila and found that roadside monitoring stations consistently recorded higher P M two point five and P M ten concentrations than general ambient stations, because of heavy vehicular traffic and urban emissions. The study also reported that black carbon, an indicator of combustion-related emissions, comprised a substantial portion of P M two point five emphasizing the influence of transportation activities on urban air quality. Likewise, Pabroa et al. reported that urbanized locations with dense commercial activities, industrial operations, and heavy traffic exhibited higher particulate matter concentrations than less developed areas, demonstrating that land-use characteristics significantly influence ambient air quality in the Philippine setting.
Likewise, Pabroa et al. reported that urbanized locations with dense commercial activities, industrial operations, and heavy traffic exhibited higher particulate matter concentrations than less developed areas, demonstrating that land-use characteristics significantly influence ambient air quality in the Philippine setting.
These findings are consistent with the objectives of Republic Act Number eight seven four nine, or the Philippine Clean Air Act of nineteen ninety-nine, which establishes the country's framework for air quality management by regulating emissions, setting ambient air quality standards, and promoting regular air quality monitoring through the Department of Environment and Natural Resources. Such policies underscore the importance of localized air quality assessments in supporting evidence-based environmental management, particularly in areas where monitoring data remain limited.
Within the Davao Region, the Department of Environment and Natural Resources- Environmental Management Bureau Region eleven analyzed ambient air quality monitoring data collected from twenty sixteen to twenty twenty-one to evaluate the spatial and temporal distribution of P M two point five and P M ten concentrations across the Davao City Airshed using Inverse Distance Weighting spatial interpolation in ArcGIS. The study found that particulate matter concentrations generally decreased throughout the six-year monitoring period, with fewer areas experiencing elevated pollution levels over time. Although localized increases were observed near major transportation corridors, particulate matter concentrations consistently remained within the National Ambient Air Quality Guideline Values, highlighting the importance of continuous monitoring and effective emission control measures. Similarly, in Davao del Sur, Lesidan et al. reported that long-term exposure to P M two point five is associated with respiratory diseases, cardiovascular diseases, chronic obstructive pulmonary disease
C O P D, and premature mortality. The study emphasized that reducing P M two point five concentrations through effective air quality management can improve public health outcomes and reduce healthcare costs. Together, these studies underscore the importance of localized air quality monitoring and particulate matter assessment in supporting evidence-based environmental management and public health initiatives within the region.
Poblacion Zone three, Santa Cruz, Davao del Sur serves as the municipality's urban center, characterized by a concentration of commercial establishments, a public market, residential communities, and educational institutions. The selected monitoring sites include McArthur Highway, and Salandanan Street (commercial areas), Sta. Cruz Public Market, Miranda Village, and Sto. Nino Village (residential areas), and Sta. Cruz National High School-Junior High, Sta. Cruz National High School-Senior High, and Santa Cruz Central Elementary School (school zones). These locations were selected because they represent the municipality's major land-use categories and differ in traffic volume, population density, commercial activity, and pedestrian movement, all of which have been identified as important factors influencing ambient particulate matter concentrations. However, Santa Cruz, Davao del Sur currently has no established ambient air quality monitoring system or monitoring station. Consequently, no localized baseline data are available on P M two point five and P M ten
Therefore, this study aims to compare P M two point five and P M ten concentrations among selected commercial, public market, residential, and school areas in Poblacion Zone three, Santa Cruz, Davao del Sur. Specifically, it aims to determine the P M two point five and P M ten concentrations in the selected areas, and determine whether significant differences exist among the different land-use categories. The findings are expected to establish localized baseline air quality data that may assist the Local Government Unit of Santa Cruz, environmental agencies, school administrators, and future researchers in developing evidence-based strategies to improve air quality, protect public health, and support sustainable urban environmental management.
Research Questions
Research Questions
One. What is the environmental profile of the selected sampling sites in terms of:
One point one Land-use classification;
One point two Population density;
One point three Traffic volume; and
One point four Predominant anthropogenic activities that may contribute to particulate matter emissions?
Two. What are the P M two point five concentrations in the selected sampling sites of Poblacion Zone three, Santa Cruz, Davao del Sur, according to land-use category?
Two point one Commercial areas;
Two point two Public market;
Two point three Residential areas; and
Two point four School areas.
Three. What are the P M ten concentrations in the selected sampling sites of Poblacion Zone three, Santa Cruz, Davao del Sur, according to land-use category?
Three point one Commercial areas;
Three point two Public market;
Three point three Residential areas; and
Three point four School areas.
Four. Is there a significant difference in P M two point five and P M ten concentrations among the selected land-use categories in Poblacion Zone three, Santa Cruz, Davao del Sur?
Hypotheses