Study Finds Rising Air Pollution in Remote Himalayan Region

The findings suggest that pollution linked to fuel consumption, transportation and local development activities is increasingly influencing air quality in areas once considered relatively untouched.

A new scientific study has found that even the remote Himalayan town of Munsyari is experiencing measurable levels of air pollution, highlighting how human activities are affecting some of India's most ecologically sensitive regions.

Researchers from the Aryabhatta Research Institute of Observational Sciences (ARIES), an autonomous institute under the Department of Science and Technology (DST), conducted a year-long investigation between 2022 and 2023 to measure non-methane hydrocarbons (NMHCs) in the high-altitude Himalayan destination. The findings suggest that pollution linked to fuel consumption, transportation and local development activities is increasingly influencing air quality in areas once considered relatively untouched.

Human Activities Driving Pollution Levels

NMHCs are reactive gases released through activities such as fuel combustion, vehicle emissions and industrial processes. These compounds play an important role in the formation of ground-level ozone and secondary aerosols, both of which can affect air quality, climate and human health.

Munsyari was selected for the study because its location offers a valuable opportunity to examine the effects of tourism, local human activity and pollution transported from other regions. Researchers identified clear seasonal variations in NMHC concentrations. Levels were lowest during winter and the monsoon season, while significantly higher concentrations were recorded during spring and autumn. The study found that the use of liquefied petroleum gas (LPG), diesel fuel, vehicle emissions and ongoing construction activities were among the primary contributors to pollution in the region.

Harmful Pollutants Linked to Ozone Formation

The research also highlighted the role of aromatic hydrocarbons such as benzene and xylene, which were found to contribute strongly to the formation of secondary pollutants, including ozone. Ground-level ozone is known to affect respiratory health and can also influence climate processes within the lower atmosphere.

Scientists noted that these compounds increase the potential for secondary organic aerosol formation, which can further degrade air quality and impact visibility and ecosystem health. The findings demonstrate that even relatively isolated mountain regions are becoming vulnerable to pollution sources both locally and from surrounding areas.

Long-Term Health Concerns Raised

When compared with other locations, NMHC concentrations in Munsyari were found to be higher than those recorded at another Himalayan site, Nainital, although still lower than pollution levels measured in urban centres such as Haldwani and Delhi. While the study indicates that immediate health risks remain relatively low, researchers warned that prolonged exposure to pollutants such as benzene could present long-term health concerns.

According to the findings, estimated cancer risks associated with benzene exposure exceed recommended safety thresholds, underscoring the importance of continued monitoring and pollution control measures. Researchers say the study serves as a reminder that environmental pressures are reaching even the most remote corners of the Himalayas, making targeted pollution management strategies and sustained scientific monitoring increasingly important for protecting both ecosystems and public health.