Well 6000m is horrible enough and about as good as it seems to get these days, but 2000m in BR!
And what chemical compounds comprise the "BR" element?
TAF VHHH 190400Z 190606 01010KT 6000 FEW010 SCT020 BKN060
TEMPO 0609 2000 BR RA FEW006CB SCT012 BKN040
TEMPO 0920 4000 BR RA
BECMG 1820 09010KT
TEMPO 2006 2500 BR RA TX24/07Z TN22/23Z
The HK Uni of Science & Technology reported that 7 years ago the "BR comprised:
Strong...concentrations of ammonium, sodium, sulfate, nitrate and chloride in PM2.5 in Hong Kong, using a Harvard honeycomb denuder/filter-pack system were measured at the different sites (HKUST, TST and Ho Man Tin) in Hong Kong during March 2000 - May 2001. We investigated the role of atmospheric mixing height in the variation in concentrations of the species in PM2.5 and quantitatively determined the contribution of the long-range transport to the ambient aerosols in Hong Kong. In total, about 40% of the measured sulfate and ammonium of PM2.5 in Hong Kong was from the non-local sources in this study. The effects of aerosol composition on the extents of sampling artifacts in PM2.5 and the contributions of individual reactions to particle evaporation were investigated. The [NH4+]/[SO42-] ratio of 1.5 is a critical ratio in the sampling artifacts of nitrate and chloride in PM2.5. Furthermore, over 250 datasets of 24-hr Respirable Suspended Particles (RSP) samples collected in 2001 from seven air-quality-monitoring sites run by the Hong Kong Environmental Protection Department were analyzed. Overall, the fine mode fraction of RSP is acidic with an average estimated molar [NH4+]/[SO42-] ratio of 1.24. The particles are highly acidic in nature with an average in-situ pH of –0.05 (–0.65 to 2.5).
Who knows how much ammonium, sodium, sulphate, nitrate and chloride are being inhaled and wrecking lungs now.