English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Nitrous acid (HONO) plays a significant role in the atmosphere, especially inthe polluted troposphere. Its photolysis after sunrise is an important sourceof hydroxyl free radicals (OH). Measurements of nitrous acid and otherpollutants were carried out in the Kathmandu urban atmosphere duringJanuary–February 2003, contributing to the sparse knowledge of nitrous acidin South Asia. The results showed average nocturnal levels of HONO(1.7±0.8 ppbv), NO2 (17.9±10.2 ppbv), and PM10 (0.18±0.11 mg m−3) in urban air in Kathmandu. Surprisingly highratios of chemically formed secondary [HONO] to [NO2] (up to 30%)were found, which indicates unexpectedly efficient chemical conversion ofNO2 to HONO in Kathmandu. The ratios of [HONO]/[NO2] at night werefound to be much higher than previously reported values from measurements inurban air in Europe, North America and Asia. The influences of aerosolsurface, ground reactive surface, and relative humidity on NO2-HONOchemical conversion were discussed. The high humidity, strong and lowinversion layer at night, and high aerosol pollution burden in Kathmandu mayexplain the particularly efficient conversion of NO2 to HONO

atmospheric chemistry and physics

Observations of high rates of NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;-HONO conversion in the nocturnal atmospheric boundary layer in Kathmandu, Nepal