Indoor air quality is an important factor in maintaining a healthy living environment. In this study, indoor particulate matter concentrations (PM₁, PM₂.₅ and PM₁₀) were monitored in a residential living room in Bengaluru, India which is naturally ventilated, using a low-cost SmileDrive air quality sensor. Measurements were taken at hourly intervals over three consecutive days from 18 to 20 March 2025, along with temperature and relative humidity. The results showed that particulate matter concentrations varied throughout the day, with PM₁₀ recording higher values than PM₂.₅ and PM₁. The daily mean concentrations ranged from 10.47–12.24 µg m⁻³ for PM₁, 14.26–16.76 µg m⁻³ for PM₂.₅, and 16.21–19.24 µg m⁻³ for PM₁₀. Overall, the measured concentrations indicated relatively good indoor air quality during the monitoring period. Temperature and relative humidity also showed normal daily fluctuations. An analysis of the relationship between relative humidity and particulate matter concentrations revealed that the strength of the correlation varied across the three days, with stronger associations observed on 19 and 20 March 2025. The study demonstrates that low-cost sensors can be effectively used for short-term indoor air quality monitoring and can give useful information on the behaviour of particulate matter in residential environments.
S. V, Shilpa Kulkarni· Middle East Journal of Appli...· 0 citations
Indoor air quality is an important concern as people spend much of their time inside buildings and may be exposed to pollutants from various indoor activities. This study examined the hourly concentrations of formaldehyde (HCHO) and total volatile organic compounds (TVOC) in a residential building in Ballari, Karnataka, India. Monitoring was carried out in the living room, kitchen, and bedroom for 15 days during March and April 2025 using a portable low-cost air quality monitor. HCHO, TVOC, temperature, and relative humidity were recorded hourly between 06:00 and 23:00 h. The results showed noticeable differences in pollutant levels between the three indoor environments. The kitchen recorded the highest HCHO (0.199 mg/m³) and TVOC (0.826 mg/m³) concentrations, mainly during cooking and gas stove use. The living room showed moderate levels, with higher concentrations during evening hours, whereas the bedroom generally had lower and more stable concentrations. HCHO and TVOC showed similar variations, suggesting the influence of common indoor sources. Cooking, ventilation, and occupant activities were found to be important factors affecting indoor pollutant levels. The study demonstrates the usefulness of low-cost monitors for residential IAQ assessment and emphasizes the need for proper kitchen ventilation and adequate air exchange to reduce indoor pollutant exposure.
S. V, Shilpa Kulkarni· International Journal of Sci...· 0 citations
Indoor air quality is of great importance for human health as people spend a large part of their lives indoors. In
this study, particulate matter (PM₁, PM₂.₅, and PM₁₀) concentrations were monitored in three residential
microenvironments — the living room, the kitchen, and the bedroom — in a house in Ballari, Karnataka, India, using a
low-cost portable air quality monitor. In addition, both the indoor temperature and the relative humidity were monitored
to examine their effects on particulate matter concentrations. Hourly measurements were taken over 15 consecutive days
(March–April 2025), with five days of monitoring in each microenvironment. A temporal analysis found short-term
increases in particulate matter concentrations during periods of increased household activity. The relatively high PM
levels in the living room were likely due to the ingress of outdoor dust, whereas the bedroom had comparatively lower and
more stable concentrations. The results showed clear differences in particulate matter levels among the areas under
investigation.
S. V, Shilpa Kulkarni· International Journal of Inn...· 0 citations
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