{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:XYHN6W6BORKH3CG7ZAPR3NIP3L","short_pith_number":"pith:XYHN6W6B","schema_version":"1.0","canonical_sha256":"be0edf5bc174547d88dfc81f1db50fdaf633eba915ce14d2eaccdb5c183d663e","source":{"kind":"arxiv","id":"1907.06525","version":1},"attestation_state":"computed","paper":{"title":"Slowing-down reduction and Possible Reversal Trend of Tropospheric NO2 over China during 2016 to 2019","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ao-ph","authors_text":"Haixu Bo, Rui Li, Yu Wang","submitted_at":"2019-07-15T14:40:09Z","abstract_excerpt":"Atmospheric nitrogen dioxide (NO2) over China at national level has been kept reducing since 2011 as seen from both satellite observations, ground-based measurements and bottom-up emission inventory (Liu et al., 2016; Irie et al., 2016; Krotkov et al., 2016; Foy et al., 2016; Liu et al 2017). These studies used data before 2015-2016. After 2016, however, a significant slowing-down of the reduction trend and/or even a reversal trend were found in numerous provinces, particularly in those with heavy NO2 level, based on satellite observations. Error analysis on satellite data excluded cloud conta"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1907.06525","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ao-ph","submitted_at":"2019-07-15T14:40:09Z","cross_cats_sorted":[],"title_canon_sha256":"3e903a94f5c217030f9abe7a345d36f8799b8255f13028b0bd0822dc5caf709b","abstract_canon_sha256":"62317f2394ea1dd35077a0f308206454d6cab292b1cb01ba6d7f9d97f86e4c32"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:37.477136Z","signature_b64":"VqIucFQy382X2DB15M2tMfsBMrHxEndhQZQbvd+D7pRZSKss7zSlQHSDaft6Z4FoHFNLE5xKJpKKQqt4RiPXCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be0edf5bc174547d88dfc81f1db50fdaf633eba915ce14d2eaccdb5c183d663e","last_reissued_at":"2026-05-17T23:40:37.476729Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:37.476729Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Slowing-down reduction and Possible Reversal Trend of Tropospheric NO2 over China during 2016 to 2019","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ao-ph","authors_text":"Haixu Bo, Rui Li, Yu Wang","submitted_at":"2019-07-15T14:40:09Z","abstract_excerpt":"Atmospheric nitrogen dioxide (NO2) over China at national level has been kept reducing since 2011 as seen from both satellite observations, ground-based measurements and bottom-up emission inventory (Liu et al., 2016; Irie et al., 2016; Krotkov et al., 2016; Foy et al., 2016; Liu et al 2017). These studies used data before 2015-2016. After 2016, however, a significant slowing-down of the reduction trend and/or even a reversal trend were found in numerous provinces, particularly in those with heavy NO2 level, based on satellite observations. Error analysis on satellite data excluded cloud conta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.06525","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1907.06525","created_at":"2026-05-17T23:40:37.476785+00:00"},{"alias_kind":"arxiv_version","alias_value":"1907.06525v1","created_at":"2026-05-17T23:40:37.476785+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.06525","created_at":"2026-05-17T23:40:37.476785+00:00"},{"alias_kind":"pith_short_12","alias_value":"XYHN6W6BORKH","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_16","alias_value":"XYHN6W6BORKH3CG7","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_8","alias_value":"XYHN6W6B","created_at":"2026-05-18T12:33:33.725879+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L","json":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L.json","graph_json":"https://pith.science/api/pith-number/XYHN6W6BORKH3CG7ZAPR3NIP3L/graph.json","events_json":"https://pith.science/api/pith-number/XYHN6W6BORKH3CG7ZAPR3NIP3L/events.json","paper":"https://pith.science/paper/XYHN6W6B"},"agent_actions":{"view_html":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L","download_json":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L.json","view_paper":"https://pith.science/paper/XYHN6W6B","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1907.06525&json=true","fetch_graph":"https://pith.science/api/pith-number/XYHN6W6BORKH3CG7ZAPR3NIP3L/graph.json","fetch_events":"https://pith.science/api/pith-number/XYHN6W6BORKH3CG7ZAPR3NIP3L/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L/action/storage_attestation","attest_author":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L/action/author_attestation","sign_citation":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L/action/citation_signature","submit_replication":"https://pith.science/pith/XYHN6W6BORKH3CG7ZAPR3NIP3L/action/replication_record"}},"created_at":"2026-05-17T23:40:37.476785+00:00","updated_at":"2026-05-17T23:40:37.476785+00:00"}