Gambaran konsentrasi partikulat matter 2,5 (PM2,5) pada waktu masak dan gangguan fungsi paru pada pekerja dapur rumah makan di Kota Solok tahun 2015 = Particulate matter 2,5 (PM2,5) consentration during cooking activity and lung function disorder among kitchen workers in several restaurants in Solok City 2015