ID: 1585

AQSQID: 460330132

Site Name: Wind Cave

Added: April 21, 2020, 6:24 p.m.

Updated: March 6, 2021, 10:32 a.m.

Location: Hot Spgs (Prairie Vista Trl), SD

Reporting: True, Located: True

Current AQI: 44.0

Hot Spgs (Prairie Vista Trl) SD, US: 43.557613, -103.483658

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 6, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 10.4 μg/m3 (10) -0.1 μg/m3 (0) 44.0
 
March 6, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 8.2 μg/m3 (8) 1.2 μg/m3 (5) 44.0
 
March 6, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A 6.8 μg/m3 (7) 0.8 μg/m3 (4) 46.0
 
March 6, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 6.8 μg/m3 (7) 0.2 μg/m3 (1) 40.0
 
March 6, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 10.7 μg/m3 (10) 0.0 μg/m3 (0) 36.0
 
March 6, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 11.9 μg/m3 (12) -0.4 μg/m3 (0) 39.0
 
March 6, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 7.8 μg/m3 (8) 0.3 μg/m3 (2) 42.0
 
March 6, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 10.9 μg/m3 (11) 0.8 μg/m3 (4) 44.0
 
March 6, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 9.2 μg/m3 (9) 0.5 μg/m3 (3) 44.0
 
March 6, 2021, midnight N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 10.2 μg/m3 (10) 1.2 μg/m3 (5) 44.0
 
March 5, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A 8.1 μg/m3 (8) -0.9 μg/m3 (0) 45.0
 
March 5, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 8.0 μg/m3 (8) -1.9 μg/m3 (0) 44.0
 
March 5, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A 10.7 μg/m3 (10) -0.4 μg/m3 (0) 44.0
 
March 5, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A 8.0 μg/m3 (8) 0.2 μg/m3 (1) 45.0
 
March 5, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A 6.8 μg/m3 (7) 0.8 μg/m3 (4) 46.0
 
March 5, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A 9.8 μg/m3 (10) 0.3 μg/m3 (2) 45.0
 
March 5, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 8.1 μg/m3 (8) 2.7 μg/m3 (12) 39.0
 
March 5, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 7.9 μg/m3 (8) 2.0 μg/m3 (9) 37.0
 
March 5, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 5.9 μg/m3 (6) 0.5 μg/m3 (3) 33.0
 
March 5, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 6.3 μg/m3 (6) 2.5 μg/m3 (11) 36.0
 
March 5, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 6.0 μg/m3 (6) 2.9 μg/m3 (13) 40.0
 
March 5, 2021, noon N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 6.5 μg/m3 (7) 1.5 μg/m3 (7) 40.0
 
March 5, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 5.0 μg/m3 (5) 0.8 μg/m3 (4) 40.0
 
March 5, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 7.0 μg/m3 (7) 1.0 μg/m3 (5) 40.0
 
March 5, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 10.7 μg/m3 (10) 1.0 μg/m3 (5) 39.0
 
March 5, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 8.5 μg/m3 (8) 2.0 μg/m3 (9) 38.0
 
March 5, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 7.0 μg/m3 (7) 2.7 μg/m3 (12) 37.0
 
March 5, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 1.4 μg/m3 (2) -0.2 μg/m3 (0) 37.0
 
March 5, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.1 μg/m3 (4) 0.0 μg/m3 (0) 37.0
 
March 5, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 5.6 μg/m3 (6) 0.3 μg/m3 (2) 36.0
 
March 5, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A 6.8 μg/m3 (7) -0.4 μg/m3 (0) 35.0
 
March 5, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 12.7 μg/m3 (12) 1.8 μg/m3 (8) 37.0
 
March 5, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 7.7 μg/m3 (8) 3.6 μg/m3 (16) 39.0
 
March 5, 2021, midnight N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 11.2 μg/m3 (11) 1.5 μg/m3 (7) 42.0
 
March 4, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A 14.9 μg/m3 (14) 0.2 μg/m3 (1) 41.0
 
March 4, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 11.0 μg/m3 (11) 3.6 μg/m3 (16) 42.0
 
March 4, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 14.2 μg/m3 (14) 1.5 μg/m3 (7) 42.0
 
March 4, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 18.1 μg/m3 (17) 1.9 μg/m3 (8) 42.0
 
March 4, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 10.5 μg/m3 (10) 3.9 μg/m3 (17) 40.0
 
March 4, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 15.4 μg/m3 (15) 2.7 μg/m3 (12) 40.0
 
March 4, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 12.5 μg/m3 (12) 0.0 μg/m3 (0) 38.0
 
March 4, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 5.3 μg/m3 (5) 2.4 μg/m3 (10) 38.0
 
March 4, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 6.8 μg/m3 (7) 2.0 μg/m3 (9) 36.0
 
March 4, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 5.3 μg/m3 (5) -2.9 μg/m3 (0) 37.0
 
March 4, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 3.3 μg/m3 (4) -0.4 μg/m3 (0) 36.0
 
March 4, 2021, noon N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 3.6 μg/m3 (4) -0.4 μg/m3 (0) 38.0
 
March 4, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 6.8 μg/m3 (7) -0.4 μg/m3 (0) 38.0
 
March 4, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 7.7 μg/m3 (8) 1.0 μg/m3 (5) 37.0
 
March 4, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 4.8 μg/m3 (5) 4.1 μg/m3 (18) 38.0
 
March 4, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 3.5 μg/m3 (4) 5.8 μg/m3 (25) 38.0
 
March 4, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 1.7 μg/m3 (2) -0.1 μg/m3 (0) 37.0
 
March 4, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 2.8 μg/m3 (3) -1.1 μg/m3 (0) 36.0
 
March 4, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 6.0 μg/m3 (6) -0.6 μg/m3 (0) 36.0
 
March 4, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 6.0 μg/m3 (6) 0.5 μg/m3 (3) 36.0
 
March 4, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 7.2 μg/m3 (7) 1.7 μg/m3 (8) 37.0
 
March 4, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.8 μg/m3 (5) 3.8 μg/m3 (16) 37.0
 
March 4, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 3.6 μg/m3 (4) 3.6 μg/m3 (16) 40.0
 
March 4, 2021, midnight N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A -0.9 μg/m3 (0) 0.0 μg/m3 (0) 39.0
 
March 3, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 1.7 μg/m3 (2) 1.9 μg/m3 (8) 40.0
 
March 3, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 5.8 μg/m3 (6) 2.1 μg/m3 (9) 40.0
 
March 3, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 1.2 μg/m3 (2) -0.2 μg/m3 (0) 40.0
 
March 3, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 1.7 μg/m3 (2) -1.4 μg/m3 (0) 39.0
 
March 3, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 3.8 μg/m3 (4) 1.9 μg/m3 (8) 39.0
 
March 3, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 5.8 μg/m3 (6) 2.1 μg/m3 (9) 38.0
 
March 3, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 7.1 μg/m3 (7) 0.2 μg/m3 (1) 38.0
 
March 3, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 6.8 μg/m3 (7) -0.9 μg/m3 (0) 37.0
 
March 3, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A 9.7 μg/m3 (9) -0.4 μg/m3 (0) 31.0
 
March 3, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 8.0 μg/m3 (8) 1.0 μg/m3 (5) 36.0
 
March 3, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.3 μg/m3 (4) -3.1 μg/m3 (0) 37.0
 
March 3, 2021, noon N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A 6.8 μg/m3 (7) -2.4 μg/m3 (0) 35.0
 
March 3, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 7.7 μg/m3 (8) 3.4 μg/m3 (15) 34.0
 
March 3, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 8.7 μg/m3 (9) 4.3 μg/m3 (18) 33.0
 
March 3, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 7.7 μg/m3 (8) -0.1 μg/m3 (0) 33.0
 
March 3, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 7.5 μg/m3 (7) 0.8 μg/m3 (4) 36.0
 
March 3, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 5.0 μg/m3 (5) 0.0 μg/m3 (0) 36.0
 
March 3, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 7.0 μg/m3 (7) -1.9 μg/m3 (0) 37.0
 
March 3, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 8.2 μg/m3 (8) -1.4 μg/m3 (0) 37.0
 
March 3, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 18.7 μg/m3 (18) -0.4 μg/m3 (0) 36.0
 
March 3, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 6.7 μg/m3 (7) -0.1 μg/m3 (0) 36.0
 
March 3, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A -4.7 μg/m3 (0) 6.1 μg/m3 (26) 36.0
 
March 3, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 13.1 μg/m3 (54) 54.0
 
March 3, 2021, midnight N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 2.7 μg/m3 (3) 7.3 μg/m3 (31) 38.0
 
March 2, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 1.5 μg/m3 (2) 4.3 μg/m3 (18) 38.0
 
March 2, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 3.3 μg/m3 (4) 1.0 μg/m3 (5) 39.0
 
March 2, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 3.3 μg/m3 (4) 0.5 μg/m3 (3) 39.0
 
March 2, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 5.8 μg/m3 (6) 1.2 μg/m3 (5) 38.0
 
March 2, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 8.1 μg/m3 (8) 0.5 μg/m3 (3) 37.0
 
March 2, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A 10.2 μg/m3 (10) -0.9 μg/m3 (0) 35.0
 
March 2, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 6.1 μg/m3 (6) 0.0 μg/m3 (0) 34.0
 
March 2, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 9.0 μg/m3 (9) 0.0 μg/m3 (0) 34.0
 
March 2, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 9.5 μg/m3 (9) 1.5 μg/m3 (7) 34.0
 
March 2, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 14.9 μg/m3 (14) 1.0 μg/m3 (5) 33.0
 
March 2, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 12.7 μg/m3 (12) 0.7 μg/m3 (3) 34.0
 
March 2, 2021, noon N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A 14.7 μg/m3 (14) 3.6 μg/m3 (16) 35.0
 
March 2, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A 7.5 μg/m3 (7) 2.2 μg/m3 (10) 35.0
 
March 2, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 3.8 μg/m3 (4) 1.2 μg/m3 (5) 36.0
 
March 2, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 2.6 μg/m3 (3) 2.6 μg/m3 (11) 37.0
 
March 2, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 3.8 μg/m3 (4) 2.6 μg/m3 (11) 37.0
 
March 2, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 5.8 μg/m3 (6) 0.2 μg/m3 (1) 37.0
 
March 2, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.8 μg/m3 (5) 0.7 μg/m3 (3) 37.0
 
March 2, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 3.1 μg/m3 (3) 0.9 μg/m3 (4) 37.0
 
March 2, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 4.0 μg/m3 (4) -0.2 μg/m3 (0) 38.0
 
March 2, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 3.5 μg/m3 (4) 0.5 μg/m3 (3) 38.0
 
March 2, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 3.0 μg/m3 (3) 0.7 μg/m3 (3) 38.0
 
March 2, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 2.6 μg/m3 (3) 0.0 μg/m3 (0) 38.0
 
March 2, 2021, midnight N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 2.1 μg/m3 (2) 2.2 μg/m3 (10) 38.0
 
March 1, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A -0.2 μg/m3 (0) 0.9 μg/m3 (4) 39.0
 
March 1, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 0.0 μg/m3 (0) 1.9 μg/m3 (8) 38.0
 
March 1, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 0.2 μg/m3 (1) 4.5 μg/m3 (19) 38.0
 
March 1, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A -0.1 μg/m3 (0) 4.3 μg/m3 (18) 38.0
 
March 1, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 2.9 μg/m3 (3) -0.9 μg/m3 (0) 39.0
 
March 1, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 5.6 μg/m3 (6) -0.4 μg/m3 (0) 38.0
 
March 1, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 3.4 μg/m3 (4) 0.7 μg/m3 (3) 38.0
 
March 1, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 8.3 μg/m3 (8) 2.1 μg/m3 (9) 38.0
 
March 1, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 11.5 μg/m3 (11) 1.5 μg/m3 (7) 38.0
 
March 1, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 3.8 μg/m3 (4) 0.7 μg/m3 (3) 38.0
 
March 1, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 3.2 μg/m3 (3) 1.2 μg/m3 (5) 37.0
 
March 1, 2021, noon N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.5 μg/m3 (5) 0.3 μg/m3 (2) 37.0
 
March 1, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 1.9 μg/m3 (2) 3.0 μg/m3 (13) 38.0
 
March 1, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 2.6 μg/m3 (3) 4.3 μg/m3 (18) 38.0
 
March 1, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 4.8 μg/m3 (5) 3.1 μg/m3 (13) 38.0
 
March 1, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 2.3 μg/m3 (3) 1.7 μg/m3 (8) 39.0
 
March 1, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A -2.2 μg/m3 (0) 0.7 μg/m3 (3) 40.0
 
March 1, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A -3.0 μg/m3 (0) 0.7 μg/m3 (3) 41.0
 
March 1, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A 1.6 μg/m3 (2) 0.5 μg/m3 (3) 41.0
 
March 1, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 5.5 μg/m3 (6) 2.7 μg/m3 (12) 40.0
 
March 1, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A 2.6 μg/m3 (3) 3.3 μg/m3 (14) 41.0
 
March 1, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A 0.0 μg/m3 (0) 1.4 μg/m3 (6) 41.0
 
March 1, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A 1.4 μg/m3 (2) 3.1 μg/m3 (13) 42.0
 
March 1, 2021, midnight N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A 1.0 μg/m3 (1) 0.5 μg/m3 (3) 41.0
 
Feb. 28, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A 4.6 μg/m3 (5) -3.1 μg/m3 (0) 40.0
 
Feb. 28, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 5.8 μg/m3 (6) 1.9 μg/m3 (8) 39.0
 
Feb. 28, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A -0.6 μg/m3 (0) 4.8 μg/m3 (20) 39.0
 
Feb. 28, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A -1.9 μg/m3 (0) 2.9 μg/m3 (13) 38.0
 
Feb. 28, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A -0.9 μg/m3 (0) 1.5 μg/m3 (7) 38.0
 
Feb. 28, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 1.5 μg/m3 (2) 1.2 μg/m3 (5) 37.0
 
Feb. 28, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 6.3 μg/m3 (6) 2.6 μg/m3 (11) 37.0
 
Feb. 28, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 11.4 μg/m3 (11) 3.6 μg/m3 (16) 36.0
 
Feb. 28, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 9.5 μg/m3 (9) 0.5 μg/m3 (3) 33.0
 
Feb. 28, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (30) N/A 5.2 μg/m3 (5) 1.2 μg/m3 (5) 30.0
 
Feb. 28, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A 3.7 μg/m3 (4) 2.3 μg/m3 (10) 26.0
 
Feb. 28, 2021, noon N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A 0.0 μg/m3 (0) 3.8 μg/m3 (16) 29.0
 
Feb. 28, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A 4.2 μg/m3 (4) 6.8 μg/m3 (29) 29.0
 
Feb. 28, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A 8.9 μg/m3 (9) 7.2 μg/m3 (31) 31.0
 
Feb. 28, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A 5.2 μg/m3 (5) 5.8 μg/m3 (25) 25.0
 
Feb. 28, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A 6.2 μg/m3 (6) 5.0 μg/m3 (21) 23.0
 
Feb. 28, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 26.0 ppb (25) N/A 7.9 μg/m3 (8) 5.3 μg/m3 (23) 25.0
 
Feb. 28, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A 8.9 μg/m3 (9) 5.6 μg/m3 (24) 25.0
 
Feb. 28, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A 6.7 μg/m3 (7) 3.9 μg/m3 (17) 25.0
 
Feb. 28, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A 8.1 μg/m3 (8) 3.1 μg/m3 (13) 25.0
 
Feb. 28, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A 8.4 μg/m3 (8) 2.7 μg/m3 (12) 26.0
 
Feb. 28, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A 1.8 μg/m3 (2) 2.2 μg/m3 (10) 29.0
 
Feb. 28, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 1.4 μg/m3 (2) 2.7 μg/m3 (12) 33.0
 
Feb. 28, 2021, midnight N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A 3.2 μg/m3 (3) 2.2 μg/m3 (10) 34.0
 
Feb. 27, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 2.6 μg/m3 (3) 0.7 μg/m3 (3) 36.0
 
Feb. 27, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 2.1 μg/m3 (2) 0.5 μg/m3 (3) 36.0
 
Feb. 27, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 4.0 μg/m3 (4) 2.3 μg/m3 (10) 37.0
 
Feb. 27, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 5.3 μg/m3 (5) 3.3 μg/m3 (14) 36.0
 
Feb. 27, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A 7.3 μg/m3 (7) N/A 36.0
 
Feb. 27, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A 0.5 μg/m3 (1) 1.7 μg/m3 (8) 37.0
 
Feb. 27, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 2.6 μg/m3 (3) 0.7 μg/m3 (3) 38.0
 
Feb. 27, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A 3.8 μg/m3 (4) 2.5 μg/m3 (11) 33.0
 
Feb. 27, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 3.0 μg/m3 (3) 3.6 μg/m3 (16) 38.0
 
Feb. 27, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 3.5 μg/m3 (4) 3.4 μg/m3 (15) 38.0
 
Feb. 27, 2021, noon N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 3.1 μg/m3 (3) 3.0 μg/m3 (13) 38.0
 
Feb. 27, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A 2.6 μg/m3 (3) 0.5 μg/m3 (3) 39.0
 
Feb. 27, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A 4.3 μg/m3 (4) 4.1 μg/m3 (18) 38.0
 
Feb. 27, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A 5.5 μg/m3 (6) 3.8 μg/m3 (16) 38.0