Plain-language explanations of the government warnings and indices Sentinel tracks — what they mean, what to actually do, and where the numbers come from. Every guide links to its primary government source.
NEA's Pollutant Standards Index explained — the official Good/Moderate/Unhealthy bands and practical guidance for each.
How dengue clusters form, what NEA's case-count thresholds mean, and the concrete steps that actually reduce your risk.
Why Zika clusters are rare, how it differs from dengue, and who should take extra precaution.
NEA/MSE's official heat stress advisory bands, and why WBGT is a better outdoor-safety measure than plain temperature.
How Singapore's UV index is measured and why it's consistently higher than in many other regions.
How PUB alerts the public, and practical safety steps for pedestrians and drivers.