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Many routine daily activities鈥攕uch as cooking and commuting鈥攃ause large recurring
pollution spikes that may impact health without significantly affecting average
exposure. We study pollution spikes by combining experimental variation in cooking
technology with high-frequency data on individual pollution exposure and time-use in
Kenya. Improved cookstoves reduce PM2.5 spikes while cooking by 51.3渭g/m3 (41%)
and cause a 0.24 standard deviation reduction in self-reported respiratory symptoms.
However, even after more than three years of daily use, we find no clinical health improvements,
possibly because we detect no impact on average exposure. Clinical health
improvements may require reductions in ambient concentrations.
