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Praya, the capital of Lombok Tengah Regency in Nusa Tenggara Barat, Indonesia, occupies a strategic coastal position on the southern coast of Lombok Island. Situated at -8.7223° latitude and 116.2923° longitude, the city’s geography is defined by its proximity to the Indian Ocean and a gently sloping terrain rising inland. The surrounding landscape is a mosaic of agricultural land – primarily rice paddies and small-scale farming – interspersed with forested hills. The urban-rural gradient is relatively sharp, with Praya itself being a concentrated urban centre surrounded by more dispersed rural communities. This coastal location significantly influences air quality; sea breezes can offer some dispersion of pollutants, but also carry salt spray which can contribute to particulate matter. The relatively low elevation (around 20-50m above sea level) limits natural atmospheric mixing. While Praya isn’t a major industrial hub, increasing tourism and associated development, alongside local transport emissions, are key contributors to air pollution. The nearby agricultural practices, including seasonal burning for land preparation, also impact local air quality, particularly during the dry season. The city’s position within the Indonesian archipelago means it’s also susceptible to transboundary haze from wildfires in neighbouring islands, particularly Sumatra and Kalimantan.

Praya experiences a distinct wet and dry season, dictating the patterns of air quality throughout the year. The dry season, typically from May to September, sees a peak in pollution. Reduced rainfall means less atmospheric cleansing, and increased wind speeds can stir up dust and particulate matter from agricultural land and construction sites. This period also coincides with increased tourist activity, leading to higher vehicle emissions. October to April marks the wet season, bringing significant improvements in air quality as rainfall washes pollutants from the atmosphere. However, the wet season can also bring localised flooding, which can exacerbate mould growth and indoor air quality issues. Temperature inversions, where a layer of warm air traps cooler air below, are more common during the transition periods (April/May and September/October), trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity. November and December generally offer the most favourable conditions for outdoor activities, with cleaner air and moderate temperatures. Monitoring wind direction is crucial; winds from the west can carry haze from other Indonesian islands.